Can caffeine induced depersonalization/ derealization l last a long time if you had excessive caffeine for 6 years ?

Made up Diagnosis: This is a made up or 'internet' diagnosis and has no basis in real medicine. It makes absolutely no sense in a medical context. I believe this is the tenth time you have asked this question. For me, it sure sounds like you need a full medical and psychiatric evaluation. There are several personality disorders that need to be evaluated given the symptoms you keep describing.