I think I have an eating disorder but I'm not sure (read body text)

Hi for context I'm a male, 25. But for that last couple years I've been struggling to eat. Sometimes it comes and goes but the last few weeks have been agony. I feel myself get hungry and I try to eat, but even when I'm starving hungry and shaking from it my body won't let me eat more than a few bites before it decides it's full and makes me gag whatever is in my mouth out or I'll throw up. Is this an eating disorder or am I crazy?