Back pain nausea cramps

Ok I’m a new mom with my first son Josiah and like ever sonce I had him I get stabbing side pain recently I have been feeling nauseous so I’m like ok I have had kidney infections four times so thatswhat it is I go to urgent care they said yea u have white cells in your pee so ur starting to have a kidney infection so I take my medicine two days later they smell like boiled eggs I hate that smell told my husband and he said that its fine just keep taking them so then I waited a week and my pain is still here and the cramps hurt so bad it’s like a can’t move and when I do I have to go steight to the bathroom and sorry tmi but my poop has been dark green and it seems like it doesn’t end I went to the er and got a cat scan and they took pee but before I could talk back to the dr my husband said that I needed to come home my son needed me so I went home I got my medical records the next day and it said everything fine but last night my cramps were so bad I couldn’t move back pain felt like I had a knife there and I called the hospital she said hey would have probly given me medicine if I stayed but she said since I left no medics or they can’t help me after that I’m so much In pain but my question is???!? Do u have side back and nause pain from holding your baby or lifting him a way that could hurt please help