I have a friend who is a year out from breast cancer and she sent me an article on something called neuropathy. It sounds like what you describe. I understand that it can cause numbness, tingling and even paralysis. You should check with the doc.
Basically it is when the nerves that go to organs, tissue and muscle are damaged from chemotherapy. In some cases it can be severe. My friend can't feel anything in the tips of her fingers and she has bad problems with her legs.
She gave me this warning because her doc told her that she should have told him about the symptoms sooner. The docs can do things to help with this problem. I am no doc but I would recommend that you do some research and have a conversation with the doc.
Hope this helps.
Cindy