My DH can't swallow at all yet, so he finds swishing with plain club soda a big help to "cut" the mucous in his mouth. He also could not be without his suction machine. Our insurance pays for it with a Dr's prescription. Please check this out. It is small and portable if you need it to be. DH uses it only at home, but we have traveled with it to radiation treatments when his mucous days were so bad that he kept gagging and couldn't lie still on the table. His machine made it bearable to get through treatment. And, your husband's oncologist needs to know about the numbness/tingling. Our oncologist wants to know immediately if this starts happening. There are some things they can give/do to help with the neuropathy.