My husband has Hypertrophic Cardiomyopothy.  He has had 2 incidents where the veins on his temple/forehead bulge and throb causing him discomfort.  He is 45 yrs old and just had a re-check after the first year of knowing that he has HC.  He had this 2nd episode after the Doctor appt. "Naturally."  It seems that both times this has happened it was very hot out.  Could this be from dehydration or could it be related to the HC?

Summarized question: How to treat hypertrophic cardiomyopathy?