I have low blood pressure. How safe is it for me to have a breast reduction?

High blood pressure is not a contraindication to surgery.  Many patients suffer from blood pressure problems.  You need to ensure your blood pressure is under control, you are taking your medications, and you notify your surgeon of your condition

I would not at all be surprised if your hypotension during delivery was related to the combination of factors you mentioned, including the presence of the epidural. For your own peace of mind, undergo a medical workup prior to proceeding with breast reduction surgery.  More than likely you will be able to proceed safely. Best wishes; breast reduction surgery tends to be one of the most patient pleasing operations performed.

I can see why they started CPR on you but you simply need to get a medical clearance from your primary physician.  You will have an anesthesiologist managing your throughout your procedure and you should be able to tolerate a reduction without issues.  Much of your problems were probably related to the delivery itself and that is way behind you now.