I smoked my first time tonight, I placed quite a large amount of DMT in between some tobacco replacement "Greengo"
and smoked one big hit, just to feel the effects since it's my first time.

After holding it 10 seconds and blowing it out, a few seconds later I got a sound in my ears, like a ringing bell.
Then the pictures on my wall started vibrating slightly, they looked like 3d Holograms, I could see they were more vivid, and intense, and vibrating off the wall in this 3d hologram like effect...

At this point I started to get really hot, and feel a bit sick.. the feeling reminded me a lot of concussion, since I've experienced that. After a minute I turned off the lights and closed my eyes, at this point my head got REALLY heavy.
Like concrete and my eyes were rolling, my head swayed and I felt my head flop backwards.

It felt like I had gone unconscious, except I was still thinking... At this point I couldn't feel my own breath.
I couldn't feel my breathing, I tried getting my body to breathe again, but couldn't tell if I was breathing or not.
While that feeling was happening I saw a purple / violet / blue what I can only describe as a worm hole... or tunnel of light. Circling slowly rotating in front of my eyes. It was very beautiful and peaceful, but I had this feeling still of wanting to be sick, despite not even knowing if I am breathing or not.. Then I fell forward and vomited. I immediately opened my eyes, got up and walked to the bathroom, got a towel, blew the sick out of my nose, wiped the sweat off my head.
At this point the sound faded back, the imagery disappeared, and I went back and laid flat on my bed, the sound slowly came back and built in intensity, but with no visual, then the sound slowly faded back and away. Then I was back, and totally normal...

Is vomiting after smoking DMT normal??? I've never heard anyone throwing up from smoking it...
It somewhat puts me off doing it again, the best way I can describe is it felt like concussion, over heating, heavy head, the n vomit... exactly like my concussion experience. Any advice if I am doing something wrong? Or Is it just a shock to the system for the first time ?

Feeling like you aren't breathing, that the air's been sucked out of the room and/or that your heart isn't beating are all common sensations and they are disconcerting. Retching or throwing up is less common. I saw a friend who already had an alcohol buzz start retching and threw up a little the first time he took a hit of vaped DMT. I chalked it up to the alcohol but have heard a couple of other accounts since of vomiting after vaping DMT.

Those alarming sensations get a little easier to tolerate with repeated use but never really go away unless you get your smoalking technique down so that you blast off on the first hit.

I purged the first time I did LSD, out of sheer shock at how high I was, like a panic reaction. I was fine once I puked and I've never done it again on LSD. Did yours feel like a panic reaction or like a nausea build up? Had you been drinking?

I don't drink alcohol at all, and never taken any other substance in my life... DMT is the only thing I was curious on ever trying. So there was nothing else in my system..

It felt like I was sick from concussion, I felt the blood rush to my head, getting really hot and heavy, then sick..
I had the same feelings when I hit my head in a door frame when I was younger, I cut my head open with a lot of blood.. and I got heavily concussed, exact same sensation. So I felt like that was the reason for being sick.
I just don't know if I will have that every single time or not....

If it were me I'd have someone sit with me to help manage things. With a little luck it won't happen again. Sounds like you had a near breakthrough experience. Drop by chat sometime and you can get good advice for smoking techniques to maximize the efficiency of your vaping technique.

My guess: there are a lot of similarities between the feeling of a concussion and blasting off and your mind is filling in the gaps. You might feel heat (my gf does), lose motor function, hear a ringing, etc. and that is unlikely to change. Try focusing on the sensations that make DMT different next time.

I would invest in a milligram scale if you have not already, experience and sensation can vary pretty greatly due to dosage ime.

Also, for future reference, a "large amount" of any psychedelic substance is generally not a good dosage to "just get a feel" for the effects.

I do have a highly accurate scale, the be specific the large amount was 0.03 grams / 30mg

though I only took the one toke

The first time i did DMT the overwhelming nature of the experience caused some nausea upon coming down. I think both my partnerand i both felt ill, but only retched. Again, i think it was a psychosomatic reaction. Maybe your next times will be a little easier.

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Well good!
And that is a much larger dose than I'd advise for your first shot.

I've always had trouble with multi-toking, practice getting all (or as much as you can) in the first (only) toke.

30mg can be quite heavy imo, generally I find myself most comfortable around 25mg, but I usually tell people to start lower and work their way into it.

5-10mg always gives me a very pleasant headspace

I get nausea as well occasionally. It's usually on the come down of a very powerful experience. I haven't. I never puked from it, just dry heaved. I think it's just the intensity of it, but I also wonder if I occasionally accidentally swallow some of the vape when I'm holding my breath.