What do braxton hicks really feel like?

Today for the first time I had what felt like moments of breathlessness (felt like the start of panic attack that never actually goes into one) and during those breathless moments I get cramps in my stomach that feel almost like bowel pains and really needing to go too the toilet feeling? I’m 25wks and have no idea what they feel? I get mild diarrhea right after getting these cramps and breathlessness too?