I might have an eating disorder
Why do you think that have an eating disorder? Is there a specific reason?
I have a lot of anxieties.  Besides that, I've been eating nothing but chocolate for a couple of days
Chocolate is tasty, however, eating only that for days is not healthy. You could become really sick and malnourished if you don't eat something else. I think it would be a good idea to talk to a doctor about this.
No way. Chocolate is the shit. I've decided I'm going to eat only that for the rest of my life.
There is no problem with eating chocolate sometimes. Just try to eat a moderate amount and make it part of a balanced diet. Also, I really think you should talk to a professional if you think you're having trouble with disordered eating.