My info is completely and utterly unofficial and more of a reference than an answer....
I have the opposite problem, REALLY low blood pressure. I was having problems with passing out or almost passing out on some of my favorite rides I'd been riding since I was tall enough. I went and talked to me doctor and she said to make sure I'd eaten and was hydrated enough to get my heart pumping (and that walking around in the parks didn't hurt either) and I should be fine to ride whatever I wanted as long as I wasn't already feeling faint or run down. I've been pretty good. We did do Everest 4 times in quick succession last time we went, and I won't be doing that again... But moral of the story is to check with a doctor, and have them do a physical if necessary. THey'll let him know what he can ride and what to do that might help before (&/or after) riding them.
Jan '07 Pop Century, Mar '07 Day Trip, April '07 Off Property, May '07 OKW, July '07 POR, Oct '07 Pop Century (& MNSSHP!!!), Dec '07 Day Trip
Jan '08 POR
Feb '08 Pop
Mar '08 Off Property
April '08 AS Sports - I think - still gotta book it