"But is PT considered medical care? "

If your doctor has to prescribe it, it is medical care.

"How best can I document my ongoing gastritis and headaches? I know these are CRPS related."

Are the gastritis and headaches related to medication you take or a direct effect of the CRPS? Do you have a report from a gastroenterologist for the gastritis and perhaps a neurologist for the headaches? WC is tough. The more documentation you have the better your chances. A lawyer is a good idea.

Good Luck
Shay