I'm so very sorry about your problem with the low blood pressure. My husband is dealing with that also. He has gone through many tests and the next one is the Lexi Scan test. His blood pressure at rising in the morning is usually 53/37. He often faints, has severe dizziness, and it lasts mostly through the entire day. He was originally diagnosed with Orthostatic Hypotension but they have since learned that he has LBBB (Left Bundle Branch Blockage) and also a calcium score of 4090. We see his Cardiologist again the day after his Lexi Scan for their results and opinion on what is to be done to help him. For now he is started on Midodrine to raise the blood pressure. He takes it 3 x a day and is on the max dosage of it. So far, there is usually the evening reading that is often 92/59 so it helps a little for him, but not totally. So, it definitely sounds like you have Orthostatic Hypotension to begin with. Only your doctor ordering tests and your insistence that they keep testing until something is found will truly help you. I'm wishing you the best and hope that you keep us updated. Your health is important and I'm glad that you are searching for the answer. Have a blessed day.