Irritable uterus? Frequent contractions?

Rachael
Anyone else out there having frequent contractions? I'm talking almost nonstop for a few hours at a time and then they go away? I saw my doctor and she said I have an irritable uterus!?!?! Said that my uterus is sensitive to fluctuations that cause it to contract more frequently. Things like : overactive baby movement, constipation, dehydration, standing for too long, over-full bladder, mental stress....