Re: severe cramping..
While most people have consistent contractions during labor, not everyone does. My sister was in labor for 46 hours with very painful cramping/contractions but they didn't form anything resembling a pattern until the last hour or so. I was with her for the last 13 hours and can attest to the fact that she was indeed in labor the whole time despite the lack of a normal pattern.
Hope you are holding your babe this morning!
Mommy to DS (6/07), DD (6/09), and DD (07/12)