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like feeling occurring repeatedly could be nerve irritation
- arm pit is supplied by T-3.
If there is nothing locally, you may have to see a Neurologist
/ you may need X-ray of Chest and Thoracic spine
It is difficult to suggest a cure without a diagnosis...
In the meantime, drugs like Gabapentin
which raise the pain threshold may be tried - discuss with your GP and get appropriate prescription.
Wishing speedy recovery