Sara,
Welcome to this wonderful community. I am sure that you will find much support and love here. I dont know if this will help you at all since your father is no longer on chemo, but when my mom first started out with her chemo they had her on an every 3rd week regimen (this was before any radiation was started). Because of the high doses they used, she would often have numb legs and she also would squirm because of the pain. They lessened the dose to once a week but a lesser dose and the problem with the legs went away. I hope that the docs find whats causing the swelling and numbness and give him something to make it go away.
Kelly