I have lower abdominal pain and hip sensitivity too and I have a hard time with underwear (when pulling up or down) my hips burn with an echo of their motion that stays for a while.
I like to wear the softest pants with preferably no outside seams.. same with the undies no outside seams and ladies boxer cut is most comfy for me.

Sooo.. this is a sensitive topic but I also burn between ..
As for the feet burning Ada that could be referred pain, or pressure from the inflamation above in the torso. Keep track of all symptoms and report them to your doc asap if they get any worse.

I hope you are feeling better soon.. hey mabie we can make RSD wear.. hmm

Take care soft hugs,
sandra