Since childhood I was very afraid of death. In the month of november 2019, there is gas problem in the body. I was terrified of dying. I overthink a lot. Then I see a psychiatrist. Then take the medicine prescribed by him. Thoughts come now and again. Now the main problem I have is that I can't use my brain to think anything. I feel a tension and pain all over the forehead all the time. I don't study right now as like before. What should I do right now?