I'm kinda thinking you have a uti or.something affecting your body.. Some form of infection (not saying std)... Id def go get checked out bc you don't want to be dehydrated
If it was me i would go get checked, it could be dilating you and that's not good if you are only 35 weeks. They say the babys brain isnt 100% developed yet. Plus if you are having that much pain it sounds like a bit more than braxton hicks.
Call your doc or go to L&D.