I don’t know why I don’t drink much anymore or I don’t eat a lot neither?

I used to always like to eat but even when it taste good I don’t eat it anymore. all my tests are normal but sometimes I do a really good job and I clean my body and I make meals and I make good videos and I exercise and I was being an adult. But then I stopped eating agin and I tell myse to drink water or juice and get a water app but then I fill up the glass and only drink half or I dnot drink until much later. I was going to learn Russian and piano and write a book but then I can’t get out of bed. I’m not sad. but everyone was telling me that I do a good job but then it fell apart again. I don’t know what to say if people ask me why. I was supposed to see my psychiatrist today but I don’t want to go I feel really embarrassed.