I used viscous lidocaine for numbing relief when I had to swallow any fluids. Other than that, Oxycodone and Fentanyl are both good ideas, the former a tablet and the latter, as Christine mentions, a patch.

Hang in there.
David 2

David 2
SCC of occult origin 1/09 (age 55)| Stage III TXN1M0 | HPV 16+, non-smoker, moderate drinker | Modified radical neck dissection 3/09 | 31 days IMRT finished 6/09 | Hit 15 years all clear in 6/24 | Radiation Fibrosis Syndrome kicked in a few years after treatment and has been progressing since | Prostate cancer diagnosis 10/18