Your abdomen splits into two separate sections during your pregnancy - I don't know how detailed your doctor was with you about it. You'll probably feel a little better after the split is complete.
I have a few suggestions:
- Get a prenatal workout video or two. That not only helped me with general aches and pains, but made a huge difference in how difficult my labor was. My two favorites were Kathy Smith's Pregnancy Workout and the Buns of Steel Pregnancy Workout. If you can't find them anywhere, I could give you my old copies (they're VHS, though)
- Try a "belly band" - it's a support band that goes accross your whole belly area. I found that pressure on my stomach was more uncomfortable than the muscle aches, but it sounds like you might be the other way around. I've seen them for sale at Once Upon a Child if you don't want to pay full retail.
- Try a warm compress or heating pad as you're relaxing before bed (not while you're sleeping). I would recommend a warm compress because that will feel good on the stretching skin too.
When you're baby is born, remember to go easy on those stomach muscles as they re-knit (don't do crunches and sit-ups right away!). The Kathy Smith video has some information about that and some post-natal exercises.