Neck issue. then 1 night , felt zaps in arm & pt of back , loss of sensation, got mri/mra both great results. later on , it was hard to write , hand was shaky , had feeling then got weak .what is this?

Parathesais/ motor: MRI of the head? rules out MS. If you are athletic/repetitive work could be thoracic outlet syndrome nerve entrapment, Sometimes cuboid tunnel and carpal tunnel if severe , may have effects radiating to forearm/arm if persists may consider EMG, also check TSH, T4 less likely if only unilateral. have seen shoulder pain with TMJ t not to hand.rarely consider mass/ CXR. F/u with neurology