How to get rid of hip pain after birth?

I had a baby 6months ago, towards the last month I got bad groin pains. I thought I'd pulled a muscle in that area but my midwife said it was probably Symphysis pubis dysfunction and I was told to rest and keep my legs together during certain activities. I did this but during labour my legs were wide open on stirrups. Since then I have had pain in my left hip and still in the groin area, especially if I pee hard and fast. I can't carry my baby for long or any form of weight. I've been to my doctor and keep getting told to rest. About a month ago I did carry a lot of laminate flooring up some stairs and now my other hip is hurting too. To top it off my right knee is now in pain, it feels very tight and hurts a lot when walking up stairs. I just don't know what to do, I'm usually a very active person, I've gone from a size 12 to a 16 and its just making me feel down, especially since I can't carry my baby far, I've tried all sorts of carriers but still in pain. Please help.