I had the plication 9/27/2013 so I'm free to move about. I had the same fear!!! When I was cleared to do crunches and abdominal workouts I had nausea. I e-mailed OCC and they said it was stomach cramping which is normal. So, after my mini-freakout.. I realized that nothing was going to happen. I've carried heavy boxes with them pressing up against my stomach, did yoga, kick boxing, pilates and nothing. No pain or nausea. One thought that I did have though was strengthening my abs so it provides a better barrier to my stomach but I believe that if anything is going with a blow to the stomach is a rupture spleen... not a ripped stitch. But trust me you are not alone with the fear. As you are able to move more and be more active the fear slowly goes away. I honestly don't event think about now, I just think about losing weight and looking amazing for the summer
Good luck... it'll be okay
p.s. I asked Dr. Ortiz about the stitches ripping etc and he said that it wont happen.