How to know if i have derealization or am i going crazy?

It sounds like: this is a pretty upsetting experience for you. I would encourage you to promptly arrange to see a psychologist or psychiatrist for a comprehensive evaluation. Please also advise your physician.

If you think: you have emotional problems that are hurting you, reach out to a professional psychologist. They will assess what you are dealing with and start working with you in psychotherapy. It will take time, but you can live a fuller more healthy life.

Eval : Derealization is a comparatively rare in serious disorder. Go to a reputable psychiatrist and get an a valuation for this as soon as possible. Ask the psychiatrist about therapy options.