help?

So something happend.explainig everything is hard.it all started with a game.how long could i live without eating.i was eating twice a day in the beginning then once and then not at all.and i thought its okay.everything is okay,everything is under controll but yesterday I was sitting in cafe with my friends and everyone ordered something an I was juts looking at menu and I hated everything there.so I just ordered french fries i couldnt even eat the half of it.I just couldnt.voice in my head kept saying that I mustnt.when every one finished theyr meal and my plate was full and they asked me why I havent eaten nothing I had to lie that I was feeling bad and left.I have serious problems and I dont know how to deal with them......