Thanks all. You are probably right about the number of hours I put into it. I'm feeling a lot of self imposed pressure to get it done before the baby arrives so that I want to sew every waking hour. Today I'm back in my easy chair and I am feeling more comfortable and I'm drinking a lot of water so at least I have to get up often to use the bathroom.
I don't want to wake up in that kind of pain again. I usually take a water aerobics class each morning and there was no way I could even think of going today. The pain easing up now so hopefully tomorrow will be a better day.