I have a back injury which was "fixed" through physio, it's a little tender this morning. I had no idea over eating could do that when pregnant very weird!
My therapist warned me about getting pregnant when I had physio. He said it would be really painful, I hope it's not but I had a protruding spinal disc, I suppose as my muscles which have been strengthened to counter it get all pushed around I'm going to end up with it protruding out into my spinal cord again 
Aww cramps suck, at least you can take pain relief though.