Thinking it was a heart attack, I went to the ER and was told I was fine, and it was probably just a pinched nerve from the fall. Three years later, the pain hasn't stopped -- the chest pain isn't so bad these days usually, but my left arm is almost continually numb and, well, the body doesn't really get used to the pins-and-needles feeling. If I had taken it more seriously, had a CT scan taken at the time, etc, it may have been caught early. Unfortunately, now that so much time has passed, doctors are at a loss as for what's going on.
I'm still finding new doctors and doing my own research into what's going on, but this process has been excruciating. So, please, if you have a fall: go to the doctor, and have them do a real examination immediately. When I went, they focused on my heart and didn't even so much as look at my neck or my shoulder; had I gone after the fall, they may have figured out what it was, and I wouldn't be in pain years later.
Hope this cautionary tale helps someone!