You might check out Vision Specialists of Michigan www.vsofm.com There are only 3 doctors who specialize in-----Vertical Heterophoria----Michigan, Pennsylvania and New York. I saw Dr Debby Feinberg last month and as she said, "I can't cure POTS but I can make things better." My eye alignment was off and in her office with correction my vision cleared, nausea disappeared and all my dizziness and balance problems are gone." I have been wearing my new glasses for 3 weeks and my POTS symptoms are better...not gone...but much better! I have some blurring after I eat when the blood leaves the head for digestion but NOTHING like it was before!!