Yeah I get this occasionally especially after I have eaten a big meal, it is so painful sometimes that I think I might be going into labor. Though I know its not, my stomach doesn't thighten even though it kinda feels like it, and feels very heavy standing up or sitting down, and I can't seem to bend over or move much at all, It definatley *****, you just have to watch what you eat, and how much, at least for me.
I occasionally get the same thing and it also hits me in the evening. I think it is just another joy of pregnancy symptom we have to deal with.
Glad u feel better now!!