I wasn't exactly sure where else to post this, and I could not find mention of it elsewhere.
When I was a couple years younger and hadn't used any psychedelics yet, I would sometimes get a brainfreeze or "ice cream headache" from eating/drinking something too fast that was really cold. It was usually like a milkshake or a slurpee. It would only happen if I drank it too fast (which I would usually do

) and I would get a brief pain in my head that would pass in a short amount of time.
After using psychedelics, particularly DMT, it seems that my brainfreezes have worsened by a lot. I drink a lot of pretty cold drinks and when the pain hits, it will last for well over 15 seconds when it only used to last for maybe three. It's not really that debilitating, but I do need to remove myself from any conversation and just stare to wait for the pain to go away.
I read on Wikipedia that the same mechanism responsible for migraines might play a role in brainfreezes. I have used DMT to completely abort a migraine before, and now I'm thinking that these factors could all be connected somehow. I'm no scientist but I think this observation could be useful to someone who is.
"Think for yourself and question authority." - Leary
"To step out of ideology - it hurts. It's a painful experience. You must force yourself to do it." - Žižek