yep.. I totally agree with the copper thing! That can be very common. I always choose multi's without copper. Consider a detox after breastfeeding is finished.In the meantime choose a multi that is copper free...eat good protein and take some extra zinc. Fish oil will help too... choose a clean brand like nordic naturals or carleson, its good for the baby too!
Sepia is a good rememdy but I would be careful with self diagnosing with homeopathics. I would consider seeing a homeopath and having them take your case, homeopathy is a great tool for reducing anxiety and helping to improve your quality of life.