Hi,
Are you taking any supplements ? keeping a healthy diet ? doing any physical activity ?
It helped me with the POTS, the tingling/burning feet and numb hands.

If your SFN progress then an immunological treatment such as IVIG might help. A few months ago I got Rituximab (IVIG is a far more conventional treatment to SFN), which has done miracles with the POTS. I got this treatment because I could hardly function at home. If you are able to function 95% it is probably not relevant.