I've considered saving up for the Celltrend POTS-diagnostics panel because of the valuable information it may provide. I experience a lot of fatigue, but no PEM. I have many autonomic symptoms but no tachycardia, with positive testing for small fiber neuropathy being a possible explanation. Could the autoantibodies it tests for still pertain to my symptoms? They seem more generalized than the panel names suggest, and I already have positive ANA and early Sjogren's. I'm in a bad financial situation and it would be a big loss to pay for another expensive test panel only for it to come back with no answers.