New Mom with Prolapse- Help, Please!

I am four months postpartum with my first child. There were no problems with the pregnancy or delivery, other than the fact that I had (at least it seemed to me) a long period of early labor. I had a natural delivery, and my son was fairly small (6.5lbs). For the first few days after my son was born, I felt a very intense falling-out sensation and could hardly walk (not sure if that’s just normal recovery- FTM), but it seemed to fade and then returned a few weeks later. I mentioned it to the doctor at my 6-week check-up; she diagnosed me with rectocele. I believe I also have a uterine prolapse, though the doctor didn’t see it (granted, I was lying down for the exam and it was early morning- seems to get worse later in day). Unfortunately, my doctor wasn’t very helpful, telling me that it’s a normal postpartum situation and to just do kegels for “a while” until it “goes away”. She said that I could just “push it back into place” when the rectocele was acting up, which is how I discovered the uterine prolapse (felt my cervix rather low).
After weeks of useless kegels, I started searching for help, which is how I found Whole Woman. I now have the book, and I’ve been trying to follow the ballet workout in there and practice the posture for about a month now. Some days are better than others, but I don’t feel like I’m making much progress. Hopefully, I will get better at the posture; it’s difficult for me to tell if I’m doing it right. Basically, maintaining the natural lumbar cure of the spine is the main idea, right? If I have days where I’m not sitting straight, shoulders back, etc., will the prolapse get worse? Some days it’s hard to remember to do after a lifetime of fairly poor posture.
I’ve heard that breastfeeding could be part of the reason for a prolapse postpartum (something about your body not producing much estrogen); have any of you experienced a prolapse improving after weaning? Or know of anyone who has? I wouldn’t give up breastfeeding just for this reason, but it’s nice to have hope that maybe things will get better when the little guy’s a bit older. I think there are also estrogen creams available (not sure if they would be breastfeeding-friendly; I haven’t done much research); any positive experiences with these?
Is there a technique that works best as far as carrying a baby (he weighs about 16 pounds now)? Is it okay to carry him on one hip, or do I need to keep the weight balanced somehow? How should I carry when transporting him in a car seat?
I was really starting to get into running before I found out I was pregnant, now come to find I can’t do it; even walking feels uncomfortable for me most of the time. Will I be able to get into running again? I used to love winter sports- is ice skating okay? Is snowboarding okay?
Sorry this was so long. Thank you in advance for help and advice; this seems like an awesome community. Sometimes it just feels so difficult dealing not only with the changes of being a new mother but also these lifestyle changes from the prolapse. I’m only in my twenties and I suddenly feel like my active lifestyle is over.