Hey SugarFree88, it sounds like you have a little bit of HPPD going on, which can be caused by psychedelics or disassociatives. I've dealt with most of the things you've described, except they were brought on by psychedelic use. It's really bad in the beginning, but it gets better with time, don't worry.
Because your reality testing is still intact, you're not going schizophrenic. I can almost guarantee you it's not a brain tumor either. The reality is a lot of people can use a ton of psychedelics/disassociatives and be fine their whole life, but also a lot get screwed, like you or me. I believe you don't see that many on bluelight, because if you have HPPD you don't want to read a psychedelic drugs forum anymore

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If it's anything like me, you'll find that your vision rapidly changes for the first month, but then stabilizes and slowly starts getting better from there. Eventually your derealization and depersonalization will go away, and with them most of your current anxiety. Vision gets better from there, but by that time your feeling pretty well mentally and you don't mind the vision that much anymore.
I hope this helps. Things that helped me is finding distractions, like exercise, going out with friends, or playing video games. Also the knowledge that it would eventually get better. Good luck! Oh, also, if this happened with and ketamine, I'd say it's just as likely it would have happened to you with mescaline, so don't kick yourself too hard.