Need info/website on Meditation for health purposes...

I am looking to control my blood pressure (yes, again). I take some very powerful drugs and am under the care of my doctor,but I don't expect him to advise me on Meditation (altho he might...I'll see him tomorrow).

I know it's all about concentrating on breathing and I have been doing that for the past few days. JUst wondering if there were other techniques I don't know about...