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Hi thanks for your query
This sounds like you've got irritation of the nerve running through the cervical disc leading to the muscle firing repeatedly.
I'll recommend doing a neck massage and some neck and shoulder stretches also
Yes I can see the flickering of the triceps muscle which looks like a trapped nerve
Unfortunately, I cannot assume what another specialist means by sensitised but you're probably right
I'm not sure abouth breathing exercies though but it wont cause any harm
I think a few sessions of ongoing physical therapy hopefully should help if not, then nerve conduction studies can be done to try and identify the problem nerve.
As I'm not a phyisotherapist, I'll have to look that up and see if I can find something
This is actually a good leaflet to look at and copy the exercises here,