I agree with Trish...not sure why they are rushing because even people with fewer issues than yours are often on meds for several months postpartum. It does take a while for things to normalize sometimes, but I do think that in time yours will probably settle down.
In my case I had high pressures when I left the hospital, but I didn't have PP Pre-e or any complications. I just had bp that remained elevated. So, I was on labetalol alone, but that didn't work, so they added hctz, and that did the trick for me. Kept my bp down to a normal level. I think my pressures were okay at 3 mos, but I didn't start weaning until 6 mos PP. And by 8 mos was done with meds and am still doing fine...thank goodness!
It is better at this point to work with your general practitioner or internist/cardiologist, as they are much better at dealing with longer term hypertension and postpartum issues. OB's generally start to want to get out of the loop on this issue after the baby is born. My experience with them PP in the hospital, I just found them not to be very knowledgeable in that regard, and once discharged to my PCP who happens to be my OB as well, things were much better because they focused on getting me on the right meds.
Overall, I just want to say, as frustrating as it is to have issues PP, try to remain calm, know it happens to a lot of us, and that most of the time it works out just fine. Some of us might be on meds longer than others, but you will feel better as your body normalizes over the next few months. Try not to rush it, and don't let them feel like you have to rush off meds.