I'm not currently, but I did breastfeed all three of my kids, two of them while on some anti-depressants and occasional pain meds (vicodin, at the time) for terrible blocked ducts I would get at least once a week. My kiddos are just fine. My oldest is ADHD but he's actually the one that I wasn't taking meds with.
That said, you have talked with your pediatrician or a lactation consultant, right? I think too many opiates will slow your milk production. Make sure you're taking fenugreek, that stuff works wonders - or it did for me.
Hugs.