My husband has suffered severe hypertension for years (with his bottom number never below 100, and his top number rarely under 200). For the past several months he has been taking several different blood pressure medicines, which will not lower it all. The only medicine that seems to lower it slightly and for only a few hours is Clonodine. He has seen a cardiologist who performed a nuclear stress test, to find his heart is normal, no blockages, but his left atrium is enlarged. So, the issue isn't his heart. In 2006, he was in a car accident and suffered traumatic brain damage and fractured his c2 and c3 vertabrae. Could this be related to his outrageous blood pressure?