I haven’t been diagnosed with anything yet but the pain sounds exactly like SFN and my neurologist said it sounds like it but after my skin biopsy came back negative in 2020 he did another EMG. The first EMG was done by a another neurologist my pain doctor sent me to, hurt so bad I couldn’t finish with the needle part of the test. The 2nd EMG showed low back problems so he sent me to a surgeon who requested a MRI that’s when the herniated disc showed up. I can walk but not far maybe a mile in pain the whole time. I’ve just finished PT after back surgery in May. I had to stop because I’m not getting better. The more active I do the worse the pain gets but oddly I can sleep thank God that’s the only time I get full relief when I’m lying down. Sitting is ok but I still have pain. Standing and walking is the worse pain ever in my feet, legs, buttocks, hips and my back tightness came after surgery. The muscle loss is in my buttocks, right side of my trunk and right hand. Sometimes I’m not sure if it’s fat loss too? I can’t afford that ive always been between 108 to 111 lbs. my husband is very helpful but he see’s me walking, cooking but have to take a break and sit while cooking but he can’t feel my pain so he doesn’t really know how bad and afraid I am. He hears me complaining all the time about it but if a person doesn’t have pain they don’t know what it’s like. Sorry for ranting.