HEALING

I'm in PT for my plantar fasciitis.  Two weeks straight, I was so happy thinking I was on the mend.  My heal flared up last week and on Sunday, I an barely walk to my car.  It feels like a bone is on my left inside heel was breaking.  Seriously painful.

Can I opt at this point to get the cortisone shot?  It's my last resort as I'm still in physical therapy. 

Please advise anyone.