I'm 29+wks too...been having Braxton Hicks contractions for 2 weeks now. I have never gotten lightheaded or sweaty, but some feel stronger than others. Let you Dr know as soon as possible. Even if it's nothing, they'll document it and continue to monitor you a little closer. Good luck and happy baby :)
I never got light headed or sweated make sure you share that info with your Doc
Before i hit 33/34 weeks Braxton
Hicks just felt like my stomach
tightening. At 35 weeks definitely got intense