I crashed at those exact same times, I have been wondering the same exact things, why it keeps coming back, why our symptoms mimic MS so much? I am not sure if it has been so bad for me because I'm crashing plus I have been under SO much stress lately, in a few weeks we are moving across the country, there has been stress with my husbands family, plus we just had a death. I'm not sure if it is that or what but i have been feeling really BAD. I have a little numb/tingling in just my left foot and hands before but it has spread all over really quickly. I am really hoping for the best and hope this crash passes soon, I was feeling so great.