Hello! Welcome and thank you for asking on HCM! I went through your question carefully and would explain that your your symptoms seem to be related to a pinched nerve in your cervical column. Besides a metabolic disorder could also explain the continuous feeling of thirst. I recommend performing a careful physical examination and some tests : - electroneurography to examine your nerves in your upper limbs for possible compression signs - blood lab tests (complete blood count, PCR, sedimentation rate, kidney and liver function tests, blood electrolytes, blood osmolarity, cortisol and aldosteron plasma levels) and urine osmolarity. You should discuss with your attending physician on the above issues. Hope to have been helpful! Greetings! Dr. Iliri