Hey Nate, i hear you. I'm on day 7 of quitting CT from Fentanyl. I had the same thought as you: my god, I'm even out of breath when I walk 3 metres!
I just listened to my body and gave it its rest. It is true tho, when you exercise and u start sweating, the withdrawalperiod should be shorter, you sweat all the meds out. Just do what your body is telling you, and a lot of good luck!
Grts Sarah (sorry for my english, not my motherlanguage)
So you jumped from opiates using an 8mg sub or you jumped from 8mg subs? How long were you taking the subs? I jumped from 24mg of subs (taken for 6/7 yrs) in jan, 2014....