I too feel wiped at that PMS time, I usually will take it down to a easier workout. As far as feeling guilty for taking a day off, I am trying to overcome this. I have been missing a day here and there cuz I messed up my back (and ignored it) and kept working out and then it spread to nerve pain on my left leg and shin...HEllO body are you trying to tell me something, so now I am going to the chiro and listening to my body, if I would have in the first place it wouldnt have got so bad or painful, I am working out when I can and if I cant then I cant I keep telling myself that muscle dosent dissapear overnight from missing a workout here or there. I too am a perfectionist and like to go 100% or 0%, ya know..gotta find a happy medium especially when your body is "talking" to you:7