It would depend on the dose of the opiates you were on. From your description of how you feel, it sounds about right.
Interesting_ i've been going back and forth in my mind to put the pills down and go on subxone wicked scared and so many things r screwing with my mind....if you can keep me posted on how your feeling this 1st week would be helpful to me to hear someone's view on it that's just starting out. Hang in there, keep your head up think, and stay positive!