Painful Braxton hicks

Tyesa
I know they aren't really supposed to be painful.. I've been having them regularly for about a week now.. Twice I have had 3 or 4 Braxton hicks back to back that have doubled me over and I can't even walk..  
Both while I'm at work.. Sitting kind of helps..
Anyone else having super painful Braxton hicks? Should I be worried at all?
I had them all the time with my first pregnancy but they weren't this painful till the last week or two.. I'm 25 weeks seems like it's early for this much pain with them