I had all the usual ANS tests (Tilt-table, etc) and was on the usual meds (Florinef, Toprol, SSRI, etc). These were all peripherally-acting meds and de-stabilized my condition even more. Read the section on Paradoxic Parasympathetic Syndrome in the link. It may seem that all the symptoms are being caused on the sympathetic side when in actuality, it's the parasympathetic excess which causes an exaggerated sympathetic response. So the treatment is to suppress the parasympathic side which is done by using centrally-acting meds. If you're medication sensitive, you can start at the lowest possible dose and work your way up every few weeks. If you look at the data in the link, it says that autonomic balance can be restored in 12-18 months (if there is no permanent damage) and some people do get off the meds. I've had definite improvement, however, I've been down this road before and I suspect I'll need to be on some meds on a continuous basis. Only time will tell. Don't give up and don't be afraid to try new treatments/meds. The most important thing is to not let this illness control your life.