I recognize some of the symptoms you describe:
“repetitive mouth/jaw movements, almost rhythmically slightly opens and closes his jaw. lateralizing his jaw, biting his lips, pursing his lips, like sucks on his tongue…incredibly restless. … constantly repositioning his legs or his arms”
The mouth movements sound like orofacial dyskinesia.
The restlessness sounds like akathisia but check the symptoms of restless leg to see which description fits best.
I would suggest you check the side effects of any drugs he may have been taking as early recognition of drug-induced movement disorders is crucial to prevent them becoming permanent.
You may not find health professionals queueing up to give you information which could result in them being sued.
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Dyskinesias are among the commonest side effects of levodopa.
I had pAIN in my right arm before the tremor emerged & this also worSt arm for dyskinesia and stiffness.
I found a couple of case reports mentioning finger-curling
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4866745/
Possible sertraline-induced extrapyramidal adverse effects in an adolescent Wang LF, Huang JW, Shan SY, Ding JH, Lai JB, Xu Y, Hu SH.Neuropsychiatr Dis Treat. 2016 May 6;12:1127-9.
On the 20th day of sertraline treatment, the patient exhibited restlessness, irritation, and disturbed behaviors… as unprovoked grinning… the patient still experienced facial spasm, tight arms, and fingers curled inward. He was unable to stand or sit still,
https://jnnp.bmj.com/content/91/8/e22.1
34 Case report of sertraline exacerbation of tics in tourette’s with OCD Paramlall M, Tyagi H Journal of Neurology, Neurosurgery & Psychiatry 2020;91:e22.
Three days post Sertraline …suffering from muscle twitches… His symptoms evolved to include: facial tics (masseter spasms, blinking, puffing of his cheek, expelling air through his lips, forehead wrinkling), complex thoracic and upper limb tics (violent head turnings with a hand grabbing motion, shrugging shoulders with violent right arm movements imitating a severe precordial thump, upper limb shaking with spasms and episodes of punching outwards and upper limb flexion with fingers curled as if he is holding an object such as a gun), Lower limb tics (hip gyration, kicking and occasional foot tapping) and vocal tics (simple and complex).
Night sweats mentioned in this article:
The ‘extreme’ side-effects of antidepressants By Lesley Ashmall 19 October 2016 BBC Victoria Derbyshire programme
Withdrawal symptoms…“I couldn’t walk and was experiencing the most horrendous sensory sensations. My muscles were burning, I had facial twitches, terrible night sweats and numbness on my forehead.”
This is a previous post of mine describing the onset and early progression of my movement disorder:
More information on akathisia:
Akathisia Author: RxISK Medical Team Last updated: 2018