We've been fighting all the time. He tells me I've been annoying and not myself and that I need to get my shit together.

Coming from a guy that completely understands what he means when he says that, he's not just saying it to insult you. Trust me. He's getting stressed out too, and he doesn't want to be stressed and cause more stress. He probably feels bad, but it is like living hell to him. He's not pushing you away because he doesn't care about you. He's pushing you away because you're stressing him out and he doesn't know what to do about it (unless he's just a dick, but it doesn't really sound like it). I totally understand where he's coming from.

I know exactly what he's thinking and was in nearly the same situation. As soon as my SO started getting treatment for anxiety, my god, life was so much better for both of us. Trust me. She was sooooo emotional. I felt bad, but it was soooooo annoying. It was so stressful and there was nothing I could do about it. Eventually I just snapped. I couldn't handle the stress anymore. Either she was going to let me take her to a psychiatrist, or I was going to break up with her (after 2 years).

You may want to consider paying a visit to your healthcare provider to get a diagnosis for anxiety (or perhaps Post Abortion Syndrome) and perhaps some sort of treatment (i.e. a prescription). Not just for him, but for yourself too. I'm not a psychologist, but I think this is most likely the case that would help you.

Men are much less likely to experience anxiety as often and to the same degree that women are. I'm not just generalizing, this is a psychological statistical fact. He most likely doesn't understand what you're going through and it's stressing him out because he doesn't know what to do about it and you're seemingly trying to drag him into it, which he doesn't want (not because he doesn't want to support you, but because he doesn't know what to do and it's giving him hell).

Otherwise, I think you should try to calmly have just a serious conversation with him privately. If he's like me, he'll probably hesitate under the assumption that you're going to terrorize him and cause more stress. Perhaps you should just emphasize that you want to be as calm and reasonable as possible.