I'm sorry. I know what you are going through. When I was first diagnosed with POTS exhaustion was up there as one of my worst symptoms. Luckily, it is the only symptom that noticeably got better after I started taking Florinef and went on homebound schooling. Really I think the thing that helped the most was the homebound schooling. I really wish I could go back to school but getting up at 5:00 and walking up and down the halls for six hours was/ is just too much for me right now. Don't push yourself too hard. I also know what you mean about the specialist. I went to the "POTS specialist" of the east coast, and got no where because he was too busy to ever answer my calls or emails. I hope you start feeling better soon.