I don't think one can self-administer a Buffalo Protocol test accurately, especially if one is experiencing problems with anxiety. The usual threshold for exertion is based on headaches and dizziness, not a sense of fatigue.

I think everybody should have a home blood pressure system, either wrist or upper arm style. They are only $30 to $40 US. A PulseOx finger tip monitor can also be useful to check just pulse, without BP. Learning to relax to lower pulse and BP is an important skill, especially with PCS and anxiety.