What Causes Pain In Heels Of Feet After Taking Percocet?

I experience pain in heels of feet after i have taken a Percocet that i bought at Walgreens. I have older percs that were bought at fred meyers pharmacy and have no pain in feet or legs at night. Tramodal did the same thing..shin pain at night. I no longer take the tramadol because it increased my bp too much. I only take one Percocet a day, and have done so for two yrs....is there a common denominator of fillers in these meds and if so what is it, and can i take meds without that ingredient