"so i&#039;ve been on tri-nessa for almost 2 months,and each time i start a new pack i get bad stomach pains and then on week 2 everything is back to normal. since i&#039;ve been on it i vomited twice and anytime i eat something my stomach feels empty, even though i ate a lot. my periods have been coming on time and my face is clearing. my only problem is the bad stomach pains."