My first childbirth was a very similar experience. I had severe hemorrhaging and was quite unwell for several weeks. Trying to breastfeed and care for my son was physically exhausting, but being my first child, I didn't realize exactly how bad a shape I was really in. I just thought I wasn't up to the task. (Of course once I went through my later birth experiences, I realized my first was anything but a normal situation.)

That birthing experience stuck with me for a long time. It was a traumatic delivery and, like you, I dreamed about it, constantly re-lived it in my mind, struggled with depression. I didn't go get help, but I probably should have.

I would encourage you to make an appointment with a therapist and work through this. The problem with going to the ER is that unless you are suicidal, they'll probably just tell you to find a therapist. Obviously if you become suicidal, the ER may be the way to go, but if you can get in to see a therapist and start working on this now, perhaps you will be able to avoid needing the ER and/or hospitalization altogether. I know going to a therapist is initially a scary idea, but it is honestly not a difficult as the ER or hospital, and it sounds like you have time to get that help now before things get that far.

You need to also talk to your OB/GYN about what is happening. They will have dealt with post-partum depression before and should be able to work with meds or refer you to someone who can. If you've already done that and the zoloft was what they prescribed, you need to let them know that the zoloft did not work. There are MANY other options medication-wise.