right toe pain

What would cause my right big toe and the one beside it to hurt? this is not just a casual ache, but a full fledge constant sharp pain. However, some days it only hurts if I touch the toes, put on certain shoes or happen to run into something. There is no redness, no open wound, no injury of any kind. just one day several months ago i happened to rub that foot behind my other foot and the pain went right thru the top of my head. I have siatic (sciatic) pain and other nerve damage on the left leg and foot. But this feels different. I have had 4 back surgeries, the 3rd one he put a screw right on a nerve and that started the pain down my leg and foot. While I have had some pain on the right side, it has been nothing like the other leg. So I don't knkow if after all these years I now have nerve damage on tht side or if this is something totally different.
Thanks for your help.