Contractions

I've had contractions since about 23 wks. My dr said it's definitely real contractions and this being my fourth, I'm pretty confident i know. Here lately, I've been getting more and more of them and they've been more and more painful! My back feels like im going to snap down the middle sometimes!! I'll have them for about an hour at a time, sporadically 2-5-7-10 min apart. Very crampy. Makes me sweat. Can't sit still. I'm not looking to be put on bedrest at 28 wks or anything, but no one else seems concerned and it honestly freaks me out.

Anyone else?!