T.,
Please do not take any supplements or herbal "treatments" when taking prescribed antidepressants. There can be dangerous interactions. If you do decide to go that route, please do so only in consultation with the prescribing physician and after you have been off of the antidepressants for some time. Also, herbals/supplements are not regulated by the FDA, so there is no guarantee of consistency between one herbal/supplement and another.
When appropriately prescribed and monitored by a qualified, licensed mental health professional, anti-depressants can be life-saving. It sounds like you are doing what you need to do to take care of your physical and mental health, and you need to be healthy to take care of your baby.
Also make sure to get some good social support in the form of mommy and me groups; it really helps to be around others who are going through the same parenting stages. You will find that many of the women in those groups have experienced PPD to some degree.
Mothering is the most wonderful and rewarding, and most demanding job we will ever do. One piece of advice that I did not take (and wish that I had) was to rest when the baby rests. I always felt I had to be cleaning, cooking, doing laundry, etc. In these early months, when regular sleep is so infrequent, it helps to get all the rest you can. Trust me, there will always be time to dust later! : )
It is clear that you are a dedicated, loving mother because you are seeking the help you need to get yourself back on track. Keep going! It will happen!! Be kind, very kind, and patient with yourself. Treat yourself as you would your best friend who was going through the same thing. When you get down on yourself, imagine it is a friend saying that to you. You'd respond with empathy and kindess, right? Well, you deserve the same response! Keep seeking all the support you need, and know that you will return to YOU!
Best of luck to you and your baby!