I agree about the thermophores, they're great! I've been using them for 27 years.

But, I have another suggestion that you may not have tried, it's the Lidoderm patches.
Lidoderm is the brand name for Lidocaine patches.
They're not inexpensive but they DO Work! So depending on what your insurance covers, and ask your Dr for Samples!
I have never used a whole patch yet, (you can cut them). But, I have TOS also, and two discs in my neck, and two more herniations in my low back. I cut about a third off each patch, stick it on (self sticking) but soft, and that pain is gone! For a day.

Hope you're better,

Pete
asb