Pain ...scary pain

Last night I had the worst pain in my back and it wrapped around to my ribs. They reminded me of Braxton hicks contractions when I was pregnant. It felt like a whole body spasm. I'm trying to figure out if it was gas. I am taking iron cause I lost a lot of blood from my c section but I am taking colace to combat the constipation but I don't think that is working. I don't want to feel like that again can someone tell me what they think ?