my husband had chemotherapy and radiation for lymphoepithelioma. He has also been using hydrocodone/acetaminaphen for over 17 years and valium a couple of years. now, he seems to do things backwards like turning a lid on a jar to the right to open it and to the left to close it. He refers to a female as a he and to a male as she. those are just a few examples but is this more likely from the cancer treatment or the drugs or both?