I agree with ericS. pain meds and loss of fat can totally be your problem. If you can start pumping up your diet with some good protein and wean off the pain meds when you can. It worked for me!

Carrie smoker 20 years-quit at 32 Dx at 41 stage 2 SSC tongue-free flap and neck dissection 25 nodes all neg. in May. bottom teeth pulled June. 35 rad tx ended in Aug.
NEVER would have made it. If it weren't for my loving wife!