Hi, I am in the same boat!:>(   I would warn about taking a extra inderal though, that is one of those drugs that like to be taken on a reg. basis. I take 40mg 3xs a day. Please ask your Dr. about that again.  I manage to walk about 6 blks with my puppy, before I get out of breath, then I head for home.  I have noticed that when I get tooo revved up(per se) I then end up with the headache.  I started with 3 blks...getting better.:>)  But, I did used to roller blade for miles, and ride the bike and just go and go...and now I feel like I am in jail or something.  So I do feel for you.  Those at the gym I was considering, said some have had relief using the pool, but I haven't tried it.  From me to you, I would watch your blood pressure and make a chart, and call your Dr. again about it.  Have you seen a neourologist?