Could be the drugs, could be the surgery, could be just that you're still recovering. I had my appendix burst and too many antibiotics ultimately afterwards and that resulted in neuropathology like you're describing (have you ever looked at all the things that can go wrong? http://www.neuropat.dote.hu/nmd.htm) and it was a result of the antibiotics (quinolines) but eventually has gotten much better but I now have trouble with asthma and some other "chronic" stuff to which I was genetically prone but which I think were exacerbated by the antibiotics. It's been 3 years since my surgery, I'd wait at least a year for your body to sort itself out, see if you can't do something with diet/exercise/rest of a non-stressful sort? Nowadays I pretty much imagine anything is possible but know my weight and lack of physical movement is the biggest hurdle I have for any illnesses and they're now at the top of my list to work on.

Hope you get some good information/help with your problems.