My symptoms came on hard and they were full body. I couldn't control my legs when I was driving and I couldn't walk sometimes. I had to lay on the ground a lot. I thought for sure that I had MS, since it had been suspected in the past (MRI in 2005). I also had heart issues - palpitations and elevated heart rates while sitting and extreme fatigue. But the weakness in SFN is a "perceived" weakness or at least that is what I've been told by neurology. I guess that does make sense.