Can you make a basic list of your symptoms? we might have ideas to help with some of them.

What kind of things is PT doing for you?
*weights, hand bikes & bands are not good until pain & sx are way down.

Did PT do an in depth evaluation?
any mention of trigger points or spasms? If spasms there are most likely TrPs present.
muscle imbalances?

Have they done any xrays yet , just to verify any anomalies or c spine issues?

Some basic things to do at home a few times a day - of course if anything increases pain or sx stop
also the yoga corspe pose is very good to start & relax with



lay on foam roll or large towels rolled up tightly - pillow if needed for neck comfort - then just relax with arms at a comfortable position