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You ought to see a neurologist
- MRI & MRA may be necessary to evaluate ischemic insult to the brain.
Your heart seems alright / a picture of panic and hypertension
may point the need to investigate Hormones - adrenal and thyroid
Neck glands must be biopsied for proper diagnosis. It may be a primary pathology there or secondary from any other source - only biopsy
Wishing speedy recovery