Hi again Boriss,
Thanks for the clarification. As you are continuing to have problems that seem to be a mix of your syndrome, neural and post inflammatory elements I still believe a review of your condition would be advisable, either with your existing neuro or a second opinion. I have to admit to some surprise that the previous MRI and nerve conduction tests were normal. There is no need for specific brachial plexus testing from what I understand of your condition. It is possible that you have had muscle atrophy due to disuse since your injury however your description points to other causes.

Regarding the TMJ. If you have a fairly high pain threshold you may be able to do this technique to yourself, but it would be best undertaken by someone with training and understanding of your condition ie not someone who knows a little bit and is scared of your syndrome.

To start: Place your index finger on your Right TMJ, then open and close your jaw whilst moving your finger until you can feel the point where the greatest jaw ligament click or pop is occurring. You may feel the bone of the jaw. Move the finger to the edges of the bone rather than over the top of the bone and angle the tip of the finger sideways into the bony edge. If you cannot feel due to sensation loss in your finger tips you will need to fiind a therapist to assist you.
Once the point of greatest click or pop is found, keep the finger in this position, stop opening and closing the mouth, then push very hard into this area for around two seconds. The technique can be very painful if done accurately.
Open and close the jaw again after a minute recovery time and reassess. Hopefully you will have less click / pop. You can fine tune this improvement by repeating the process to find another spot on the same TMJ as well as repeating it on the opposite TMJ. I would not do more than two pressures per TMJ at each session and space sessions a couple of weeks apart. You will need to gauge the pressure used regarding the grading of your syndrome to avoid bruising, although it is normal to be sore over the TMJ following pressure.
If you do not gain improvement it could be due to a number of reasons. 1. the diagnosis is different to why you have the symptoms. 2. The technique needs refining.

Let me know how you get on. Good luck.
Regards,
MrPhysio+