Could Headaches Be Due To Anhidrosis?

IM TOLD I HAVE Cou DUE TO A THORACIC SYMPATHECTOMY YEARS AGO, CARRIED OUT FOR UNDERARM SWEATING. I WASNT TOLD THAT ANHYDROSIS COULD BE A COMPLICATION OF THIS SURGERY. DO YOU THINK THIS OPERATION COULD BE THE CAUSE OF MY HEAT INTOLERANCE? I THINK I MAY HAVE HAD ANHIDROSIS BEFORE MY OPERATION. COULD THIS BE CAUSING MY HEADACHES? IM NOT SURE WHICH TESTS COULD CONFIRM ANY OTHER CAUSE.