Hi cymbalisty,
I'm sorry to hear your are dealing with this. It's a hard time – there is no doubt!
If you are looking for information about medications you would need to talk to your health care provider, and to do your own reading about what medications are safe while breastfeeding this website: http://www.motherisk.org/women/index.jsp is an EXCELLENT resource. There's always up to date research, and if you don't feel up to the task of reading through it, there is a 1-800 number you can call to talk to someone and ask questions.
In addition to chatting with your health care provider I would suggest: take time to yourself if it's possible, get the help of family and friends – and/or a postpartum doula, connecting with other new moms that can relate to the exhaustion etc., time outside in the fresh air, and do something for yourself – what makes you feel good usually? going for a pedicure? taking a relaxing bath? a walk? I recently found that escaping into a book was a good way for me to get some "me" time without having to plan an outing.
Best of luck, and I'd love to hear what things you find helpful!
I'd love to hear from other mamas how they've coped through the baby blues as well.