I too have fatigue with my SFPN. My feet swell and feel like I’m walking on marbles. Legs feel heavy and don’t pick up my feet as I should due to muscle weakness, I believe. As a result, I have tripped and fallen a few times which has been scary. I also have shortness of breath which I attribute to CFS due to having Covid for the first time in Dec. 2023. I’m 81 and will start doing feet/leg exercises faithfully to hopefully prevent falls.