Back pain HELP

When I had my first daughter I had serious back problems even when pregnant. I would be stuck in a position either standing or sitting or laying down. And moving any muscle will make me yell off of the top of my lungs. Its pain. The Dr never did anything and just gave me codeine for pain after having the baby. Now she's 3 and I'm pregnant with #2. I'm 13 w 6 d and this back pain is back. Its the same. I can't do anything. What's safe to do for back pain. Give me all your little remedies or medicines that help you!!! Also is it safe to put icy hot while pregnant.