I'm not sure which strains specifically would help, but I want to say that I think a little THC might help ya out a little bit more than what you're suggesting (you know, as opposed to seeking CBD-dominant shit). Any type of hybrid, most likely indica-dominant considering the opiates, would help with withdrawal symptoms so much more than strictly CBD.
Keep in mind, though, there's no weed that's gonna eliminate the withdrawals. It'll help you cope through the sickness, no more or less. As long as you don't expect a miraculous W/D pass, you'll do just fine.... it's gonna suck, but you'll survive, man.