As I read your post, the first thought that popped in my head was shamanic journey. I have practiced shamanic journey as a hobby of sorts for a few years. It popped in my head because of the similarity to what you have described.
Shamanic journey is about going into a trance. You allow your mind to be carried away. Allow your imagination to get carried away. You don't interfere with it. You allow your imagination to create it and experience it as if it were real. It is all about observing and being present.
You can play games with shamanic journey. Try and find something lost, I never have, but have tried because I thought it would be fun. You can try and meet your spirit animal or spirit guide. You can try and find lost pieces of yourself. I think you get what you put into it. Research it if you like. I think it's interesting and enjoyable!
Shamanic journey also has some tools that are supposed to help with your journey. You have to learn to protect yourself before you journey. You set up your mind to be powerful and strong before you set out. Ceremony is important. You can create your own ceremony any way you see fit. I find these tools have also helped with psychedelics and meditation. Tools. Just more tools.
I think it would be helpful for you to find some tools. Meditation could help. I am a proponent of psychedelics in general as I see them as tools, however, it is a highly personal choice to use them or not. Try shamanic journey.
Get into touch with these visions. Explore them and find out what they mean to you. Only you can say for certain but I think the only way to do that is to explore it all in detail, as long as it does not cause you discomfort.
Ghandi said, "I will not let anyone walk through my mind with dirty feet."
If something is trying to get into your mind, do not allow it to get into your mind. Some entity tries getting into my mind and it would be laughed at and booted to the curb. You could even imagine doing as much to be honest. Just don't allow thoughts in your mind that do not serve you. Easier said than done I am sure but there it is.
Hope everything works out for you! I have no clue if this is helpful for your situation or not. Good luck!
"In the universe there is an immeasurable, indescribable force which shamans call intent, and absolutely everything that exists in the entire cosmos is attached to intent by a connecting link." ~Carlos Castaneda