TN can be related to an upper neck or brain injury to the occiput area. Inflammation to this area can exacerbate these symptoms. Have you had any intense imaging of this area. An MRI of the upper cervical area with the head turned sharply to each side can show instability. This instability can cause inflammation during sleep. This inflammation can cause sleep apnea, poor brain blood flow and other issues.

It would be worth trying sleep positions to minimize odd neck positions or any neck flexing during sleep. I have to sleep on my back with minimal pillow height and with my pillow so that my head does not tip to the side. For me, it can be a problem if my head rolls to the left while I am sleeping.

This is not necessarily your solution but trying different sleeping disciplines can be worth the effort.

My best to you.