When is your next doctor's appointment? Those things need to be raised with them. Two things:
1. Do you always take the prednisone after food to protect the stomach lining?
2. Do you drink extra water as recommended with prednisone?
Regardless of what is going on, those two things can only help. Talk your symptoms over with your doctor. There could even be an interaction happening with one of your other meds that needs attention.