Menstrual Cycle

Recently (or is it past 3 years?) Ive always been scared of my monthly cycle. Okay I remembered. Its been like this since my obgyn station in my clinical years (means 4 or 5 years ago) I always hv dismenorrhea in my period. So, everytime I learn new diseases I become paranoid NOOOOO :'O I reaaally hope that everything is perfectly fine.