I have suffered from anxiety, depersonalization/derealization for 2 months. i keep feeling doom that i will die or go insane and harm myself any tips?

Need more than tips: It sounds like you really need to see a psychiatrist about your symptoms -- they sound very painful and very severe. This needs to be an emergency evaluation since you feel that you will die, go insane, or harm yourself. You can be seen in an emergency room, and the doctors there will help you get the care you need. Best wishes.

Because you are suffering the sooner you get help the better because if you delay it could get worse. Please have a physical exam to know if these symptoms are due to an illness. If not, please see a Clinical Psychologist with expertise in multiple types of psychotherapy and a Psychiatrist for medication. If your thought lead you to plan action to harm yourself please go to an ER or Urgent Care.