I'm not sure what's happening to me

So recently my friends and myself have noticed a few changes in me.....

Iv been suffering recently with an eating disorder for the last 5months iv only been eating once every few days because iv not really been hungry along with this iv not been tired so getting 5hours sleep a night.... in the past week we noticed that all iv been doing is going to bed really early at night like 9 and getting up at 7 and still feeling really tired along with this I have done nothing but way and be hungry and when eating just thinking about what I want next... what does this mean? Is it normal is it because of my cycle or my friend seems to think I'm pregnant but me and my boyfriend are careful we use a condom or he pulls out