Andrew in my case, my POTS (Dysautonomia) is caused by Autonomic Neuropathy. With the breakdown of the autonomic nervous system, most every system is involved. So breathing, digestion, circulation, severe nausea, no more sweating or too much, tachycardia, chest pain, dizziness, lightheadedness, vertigo, high or low bp, temperature regulation is a big part, fainting, blood pooling and turning purple, etc. Nothing works in the body since almost every part is affected.
A number of illnesses can cause POTS. The reason needs to be found to begin to heal.
There is no wonder it makes people so very ill. Some people are less ill if they have less of a total breakdown of the ANS. But, I had it all. Unable to function. Over three years my doctors and I have been able to treat the nerves that cause it for me. Healing the nerves all over the body like the heart, muscles, etc.Nerves heal slowly and there are a lot of things they require.