Definitely talk to your doctor more about this.
I'm sure there are medications that can help you that won't harm your baby until you are able to work past this.
Keep in mind your hormones are just all over the place too so that could be part of it, but postpartum depression is real and it's serious, and there's no need to suffer.
I never had PPD, but I know women who did and they truly weren't themselves. It didn't make them bad wives or mothers, it just meant they needed some help getting their systems stabilized for a while.
I do believe your doctor can help you!
I had such a nightmarish pregnancy that the hospital social workers kept a close eye on me after I went home. They never failed to let me know that if I needed help, all I had to do was ask and they never would have done anything to harm my precious new baby.
Talk to your doctor. Make sure you have a good support system around you and don't be afraid to ask for help.
I'll keep you in my thoughts.