Do you guys have any ideas of what could I do?

Hello people! It has been almost 2 years since I started to struggle with going out. It became with panic attacks, that I didn't know that were panic and it went on worse and worse. Currently I almost don't go out anywhere except for medical purposes, and even in it is so hard to stay still and don't panic. It seems like I'm stuck in fight or fight since, I try to do sympathetic work exercises but the relief doesn't last too much. Besides, I have an undiagnosed illness, that makes me feel so weak sometimes, I did a lot of exams and everything always came clean. For months I have been with huge tooth cavity and also in need of doing a root treatment, I think this is playing a large role in my health state, but I feel like I just can't go through it. Some weeks ago I went to the dentist, did the procedure quote (only it was awful, I felt like passing out) but couldn't go back and do it. Adding more context, I'm on therapy and had been doing really tiny exposure, since I wasn't going out anywhere, but I'm two weeks without going nowhere again. I tried to create some urgency in my mind to do it, but the panic seems bigger than the urgency. Do you guys have any hints what could I do to go and don't pass out? Thanks in advance <3