For a while now, i have been having irrational thoughts regarding my own health. i feel very concerned at the smallest things. how can i treat this?

See doctor: It is likely that what you are experiencing is a manifestation of depression. However, that needs to be evaluated by in-person examination and you should see a doctor. There are effective medications to treat depression. Wish you good health.

Health anxiety: It might be helpful to start working with a therapist to sort through and to cope with the health-based anxiety you feel. It may also help to see a general practitioner for a full check-up as part of this so that you can start off your therapy with full knowledge of your overall health.