Treating orthostatic hypotension

My mother entered the hospital 39 days ago due to bleeding from her intestinal tract. After tests they determined it was a case of diverticulitis. While she was there she became orthostatic hypotensive where the blood pressure dropped significantly that she passes out. She has had dizzy spells in the past but not to this degree. About 3 years ago she was diagnosed by a neuro surgeon that she had stenosis and it was recommend that she remove the bulging disk from her neck but she decided not to.

Getting back to OH, doctors have tired most all the standard techniques and medication combination to treat this but with no success. She finally had surgery last week on the neck with hopes that the nerves being compressed may alleviate the blood pressure control, but so far that did not help.

Cardiologist suggest we try a pacemaker to help control the beats per minute of her heart to increase flow. Another cardiologist suggested this won't work and preferred we try Mestinon and Midodrine. They installed the pacemaker and the next day they tried to get her up and the blood pressure still dropped. The doctor instructed the nurse to administer the Mestinon and Midodrine in the morning before trying to get her up. Heart maybe pump more blood, but it's still going down to the lower extremities.

Anyone have any inputs of where to go from here? Is this it and she is bed ridden for the rest of her life, which they suggest may be limited due to the fact she is bed ridden or wheel chair ridden?