Painful itch on soles of feet?!?

Ok this might be kinda long.. 5 weeks ago i gave birth to a healthy boy. My 2nd child.. I had an epidural with both births.. But this recent epidural messed me up.. The insertion of the epi went smoothly, but after a few hours it started to wear off, so the nurse gave me a shot of something thru my iv,.. and this shot numbed me good, i couldnt feel a thing.. after i had baby and the epi was taken out, the numbness started wearing off like normal, everywhere but my right lower leg/foot. It stayed numb and extremely swollen for 3 1/2 weeks.., i could barely walk.. It is still slightly numb in some spots.. They did an MRI while i was in the hospital and said it didnt show anything, and they could not give me a reason for why this was happening, so after 2 days in hospital i was sent home to deal with it on my own. I personally believe they knicked a nerve when inserting the epi.. Anyways, for the last week now, i have been getting this horrible painful itch on the pads of my feet, mostly my right foot. It only happens when im standing, and its almost a throbbing feeling with an itch. I have to sit down until it goes away, takes about 15 minutes.. Its starting to really bother me. What is this?!?? Could it be caused from nerve damage? Will it go away??