I think I broke some ribs....do I have to do anything or will they heal by themselves

You should go to the dr to see what the extent of the damage is. Sometimes they will put you in a gurdle, but sometimes they just heal on their own. I had a broken rib when I was pregnant, but they couldn't do anything and it just healed on its own.

You should at least get an xray to determine the extent of the damage. The customary treatment for broken ribs is to tape the upper torso so the ribs can heal without excessive body movement in that area. But it is also possible you could have caused internal bleeding or punctured an internal organ with the broken rib if the break was serious enough. See a doctor and get that xray to be sure. You might save yourself a lot of pain and complications down the road.

You need to go get x-rayed. especially if you are having trouble breathing(sharp pains). Broken ribs can puncture your lungs and that can create a whole new mess of problems. Especially if you don't get proper medical care.