I've been on zoloft since the birth of my son two years ago. I'd say it took me the better part of two years to recover from PND, and joining a support group that met once a week played a large part in my recovery.
I have had a history of panic attacks though, although I had not had one in years when I had my son. The way I dealt with them in the past, and eventually stopped having them altogether was to do the following: When I felt one starting, I would sit down and say to myself "Okay, here comes a panic attack. That's fine. It feels terrible but I know nothing more is going to happen than just feeling bad." and I would actually invite it to come. The difference was, I would disconnect from it and simply view it in a detached way, noting what different things I was experiencing - like nausea, heart palpitations, my blood rushing etc.
The thing about panic attacks is that they can't hurt you - you aren't going to die. The more I accepted mine the less impact they had on me and eventually they stopped happening. I honestly think it's because I just wasn't afraid of them anymore.
Maybe if you could find a way to no longer feel so afraid of having them, you could work on just coping with them. Maybe ask for some Alzam (like 3-6) that you could have, just to keep as a safety net. So when you have a panic attack you try and cope with it, but you know you have something to fall back on.
I know it doesn't feel like it, but eventually you might be able to see this experience as a gift. It is pushing you to learn more about yourself and to sort out things from your past. At the end of the day you will become an even more brilliant mother than you already are! And well done for getting help because so many women are too ashamed!