Tightening of the belly, NOT BH - lasting for hours...

Mai
Hello out there,
I'm currently at 38 weeks and I've been experiencing with my whole belly tightening after dinner.  It usually stays like that for hours on... Actually it stays all night and its getting not only uncomfortable but its hurting in a way that I cant always sleep.
My Dr says its too long to be Braxton Hicks, probably more on the muscular side.  But no one seems to know what to do to get rid of those or even just make it less hurtful...
Anyone else?