I'm hungery but i have no appetite?!

I will be out with my friends or something and haven't eaten dinner or anything and I will be thinking about food and start to get really hungry. Then I come home and look in the fridge and all my appetite is totally gone. I tried to take a bite of food but i just didn`t feel like eating, the thought almost disgusted me. I feel kind of weak since i havn`t eaten for like seven hours and i know my body is hungery and my stomach is empty but i don`t feel hungry..this has been going on for like 2 days. I have forced myself to eat breakfast and lunch though but I don`t really eat dinner idk why!