I talked to my pharmacist about this after you gave me the same warning about imitrex. She said that at the current usual dosages it was only a significant concern if you had a pre-existing cardiovascular condition.

Your brother-in-law presumably inherited the family predisposition to hypertension. And given your multiple sensitivities I can certainly see why your doctor would be careful with you. But apparently this isn't a problem most of us have to worry about.