How can I ease the cramps of Diarrhea?

That's unusual that you are alternating b/w diarrhea and constipation. Maybe you have irritable bowel syndrome. As for the diarrhea and cramps, you can try eating a banana. I know it is the last thing you want to do right now, but it might help. When I was younger I had a stomach flu where I had severe diarrhea all day (I felt nauseous as well). My mom finally got me a banana and insisted I eat it. I slowly ate it (so that I wouldn't throw it up) and my diarrhea completely stopped! I don't want to steer you wrong if there is something more serious happening, but this is my best advice. Hope you feel better soon!