Periphery, definitely take a break from psychedelics until you get your situation checked out.
I wouldn't bother informing your doctor, as any doctor is likely to tell you not to take DMT.
If you don't take stimulants then I think you'll probably be ok. IMO stimulants are much worse for your heart/blood pressure than DMT.
How high are we talking for your blood pressure?
My advice would be to make lifestyle changes that lower blood pressure. E.G cutting out salt/fat, considering a vegetarian diet. Monitor your blood pressure over 3 months after doing this, and then consider doing DMT.
Are you prepared to make these sacrifices in order to enjoy DMT safely?"Language is a cracked kettle on which we beat out tunes for bears to dance to, while all the time we long to move the stars to pity." - Flaubert
I do not engage in or condone illegal activities. Most of what I write is on behalf of people I've bumped into, usually several years ago and in countries where the things I mention are legal.