To be honest, with your option to be able to move back home, I want to give you my input.

I know it would be hard to maintain long distance but you should consider the alternatives too. Assuming, from your writing that it was spoken about between you and your gf, that she would join you later, keep in mind it is temporary distance.

With that being said, consider that right now you are dealing with mental issues that affect your relationship. you have no options for medication and it sounds like you are completely on your own (without docs, I mean) there. The thing I want you to think about is the outcome of long term problems with this stress without help, on your relationship. Over time, the stress this is putting on you and your gf both will take it's toll and worst case could ruin your chances for a happy future.

negative of moving would be the long distance thing (again assuming it's temporary eve if all the way in dec) but it's offset by the fact that a big chunk of your problems could easily be eliminated. You would gat the help and/or medications you need. When she joined you, most likely you'll be much more stable anyway. Also keep in mind that her depression and issues right now may be tied to yours and working a lot plus having to cope with your anxiety regularly. So potentially your moving back, getting help would also help relieve some of her stresses and depression.

I dont' know if this is the best option for you - the move back, I mean. But.. in my perspective from looking at the whole situation and considering all factors, it does seem like potentially the better option of the two.

Hope this helps.