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low blood pressure is worse than high blood pressure because there is little you can do to make it go up. Low blood pressure is normally seen in people dying. 80/40 they should have sent you to the hospital to check for internal bleeding which is a cause for this. I would get an second opinion. I am only a medical assistant and am not diagnosing you but letting you one cause that I learned about. Did they check to see if you are anemic I am not sure if that can cause low blood pressure or not. My normal b/p is 90/60 which is in the normal range.

Blood pressure measurements don't count for anything if you've been walking around. Ideally, you should be sitting down for at least 5 minutes or so. Blood pressure also can vary during the day, so it's best to get measurements from similar times during the day. No caffeine in the morning either. These measurements should be repeated on a few separate occasions. Some people get "white coat hypertension" when they go to the doctor's office because they are nervous. Probably blood pressure medicines wouldn't kill you. But you don't necessarily need blood pressure medicines if your blood pressure is only high while active. When doctors study the effects of high blood pressure, they study the effects of people who are diagnosed with it as described above. You are probably at no higher cardiac risk from your blood pressure.