just had a baby how do i get back in shape with a bad back?

i just had my second baby she came out healthy and perfect :) i on the other hand had problems i almost died from hemorrhaging for two day unnoticed till i flat lined for 3 in a half minutes. when i finally came to they said that when they tried taking the epidural out it knocked a disc out of place needless to say i have back pain and lack of iron i want to get back into shape build back my muscles how do i start? what should i do?
just had a baby how do i get back in shape with a bad back?
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