Braxton hicks??? 25 weeks

So for 3 hours I have had almost constant belly tightening with quite strong pain in my back and lower uterus, also accompanied by strong nausea and the feeling of needing to go for a number 2.

The last couple of days I have had light pink bleeding, and been checked at the hospital but the cervix was closed. The tightening is enough to take my breath away and has had me crying. I've tried drinking water, a hot bath, changing positions, all of which haven't helped or stopped it. I guess I'm looking for input from others or any experience. I have 2 other children so don't want to go up the hospital to be sent home again. I just want the tightening and pain to stop 😓