Hey My Stomach Has Been Very Active For The Whole

Hey my stomach has been very active for the whole month of Oct. Like a tighten filling,sharp cramps,like I'm hungry all the time and sometimes my stomach hurts when I get hungry and if I don't eat right away it feels as though I'm about to vomit,and it hurts to lay on my stomach and I get full really quick,my period supposed to came on,on the 5th but didn't.can you tell me what's going on?