Well your blood pressure is low, and if you are not taking any other medication for this issue, then beta blockers could be the cause. However, I would still highly recommend speaking with a Doctor first, in case there is another reason for your low pressure.
mostly i find my blood pressure is 90/60 or 80/50 sometimes 100/70.
To stop any beta blocker should be advised by a Doctor because there can sometimes be problems, such as arrhythmia. What is your blood pressure now? what are you classing as low?
During my bypass surgery i had high blood pressure in 2008 i was told to tk metroprolol 100mg twice a day,
then was reduced at 50mg twice a day. now my blood pressure is geeting lower low blood pressure is it adviceable to stop metroprolol ?
It doesn't sound like you are being aggressive enough with lifestyle changes? Have you altered your diet? do you smoke? are you exercising regular? Have you reduced emotional stress levels? even if it means changing jobs. One or more of a combination of several things can cause your disease to continue and you need to get on top of it. With your diet it could be something simple like high processed sugar consumption. There are genes which make us more likely to get heart disease, but in most people we need triggers to make it start. Is your blood pressure being kept at normal levels? is your blood cholesterol level normal or low?
You should definitely see your cardiologist as soon as possible. It is possible that you have restenosis of one of the previous stents or disease in a graft. You will likely need another catheterization to evaluate your vessels.