Does my 2 year old son have a eating disorder or something deeper?

So my son will be 2 soon, he refuses to eat. He literally starves himself. When he sees food he cries because he just doesn’t want it. I been breastfeeding since birth and he will ONLY have breast milk. That’s how he gets thru the day.

I’ve tried everything, baby purées, baby food in general, I’ve tried all different types of regular food, and he purposely makes himself gag to throw it up. It’s very serious, I don’t understand why he’s doing this and he’s been doing this for months! I told his doctor the first time and they told me “kids go thru their picky times on what they want to eat” and I tried explaining, no he won’t eat ANYTHING, he goes an entire day with nothing in his stomach! I sent another message so they can schedule an appointment because this isn’t healthy.. he’s to young for this!

What do you guys think is going on? I’m so lost right now, I’m depressed, stressed, I can’t think straight. I just have no idea what could be potentially wrong!