I havent been eating much. why?

i used to eat a lot a few months ago...like a lil bit every few hours n i kept a good weight for my age...i was around 115 n now i am 107. about 2 days ago i noticed that i wasnt hungry in the morning...but i ate eggs but i wasnt able to eat all of it...n later that day i tried to eat rice but i only ate a couple of scoops...n later that night i ddnt feel like eating but my bf made me n i felt like throwing up...i havent been getting hungry...yesterday i only ate a lil bit of ice cream, grapes, strawberries n chips...at night i felt hungry n just took 3 bites of a pizza n i wasnt hungry anymore...i am a lil bit depressed...is it cuz of that?