Am i pregnant or what could it be?

My period ended about a week ago. Since day two after my period I started getting bad cramps, abdominal pains , coming and going. Some pains much worse then others . I've also been feeling very dizzy all of a sudden out of no where. My appetite is almost none and I'm quite the eater! I drink plenty of water and try to eat. I'm just wondering what could be going on with my body? Its not normal for me to feel like this after periods. Any feedback is appreciated. Thank you!