What can i do to help?

I have my exams coming up soon and I will be on my period twice! During the time of them. I get bad periods with cramps,nausea and a very upset stomach (ifygm 🫣) I’m already on mefenamic acid to reduce my heavy periods and the pains that come with. I’m honestly just scared that I’ll be ill/have stomach issues or faint etc like I have in the past w my periods and I’m not sure how I can reduce the chances anymore especially during my exams!