There is a certain point that the adrenaline from anxiety and panic can take you to, but it won't pass that point. I was almost housebound, probably in a very similar mindset as you about 8 months ago. I would get extremely dizzy and feel dissociated. I felt so unsteady on my feet that I had a fear that I would just fall down, which is probably similar to your fear of passing out. I had read a book by a anxiety sufferer (who ended up completely recovering), and he advised that that the only way to really end the fear once in for all was to go out in spite of it and even welcome it. This is the hardest thing to do, but it's also probably the quickest way to end your fears. So I had to remember that, while the adrenaline and my tired nerves would take me to a point of extreme dizziness, I would never actually fall down- the adrenaline can't force that no matter how panicky I am. Same with passing out.
I would say, if you haven't, go to a doctor to get the reassurance that it is only anxiety/ nerves that are causing your symptoms. Once you have this reassurance, the next step is to test the waters and challenge the adrenaline to do its worst. Once you are pretty confident that you are not going to pass out (because time and time again it does not happen) the next step is to slowly desensitize yourself by going out. It is okay to rest sometimes, but err on the side of activity rather than staying in your comfort zone.
And as to medication, there is no hurt in being prescribed something. I never did take an anti-depressant, although I really wanted to at times. Instead I just took a Xanax every few days if it got really bad to give myself a break. But it was every time I wanted to take the Xanax and didn't that I had a true breakthrough. Go at your own pace. Returning to your functioning self will take time.