Awful pain in side at night?
I get crazy round ligament pain (so lower/side of belly) and rolling over without preparation (holding my belly and "lifting" it as I roll) is a sure fire OUCH! And the stabbing pain can last for minutes too. A friend of mine had one of her ribs "pop" and it caused her problems from there on out.
Maybe show your care provider exactly where you feel the pain and see what they suggest?