It sounds like you're really sensitive to other's emotions around you (noticing the slight tone difference in your GF's speaking is what caught my attention). While I think it's a good trait to have in understanding people, it obviously can backfire in overwhelming yourself; feeding off others erratic behaviour until you crash. Sadly, it's not easy to break free of this thought process. I myself an still struggling, and have actually been locked away in my home for months now with no job nor friends to talk to. To border yourself off from everyone will only make it worse if you stop trying (even if it's a much more comfortable and safe haven to live within).

I don't suppose you're on any medication? I understand that after constantly experiencing panic attacks, getting fired and basically living in fear of your illness and others reactions seems impossible to handle, so maybe meds can balance your way of thinking (or talking with a therapist could be an option, I feel you would benefit from these.. however I can't say for sure as I've not tried those myself). Of course, this is under the assumption you're alright with changing your view, thoughts and way of perceiving such things.. altering yourself for others is a simple way of putting it. I for one am against that, which is why I've opted to trying to find a more natural approach, but hell if that's even working.

Life is difficult, and often times I'll question "why", but honestly the only thing keeping me going is the unknown in hopes that there is something to work towards, even if the world is filled with angry souls. There's got to be something worth it out there, y'know? I apologize if my rambles were of little to no help, I do wish you the best though.