Severe menstrual cramping. I'm 36 years old?

Cramping. Menstrual cramping may be caused by quite a few conditions including endometriosis, adenomyosis, fibroids, primary dysmenorrhea or even an infection called endometritis. This space is too small to discuss it in detail. Have a thorough gynecologic check-up and ask questions about these conditions from your physician. You mar need an ultrasound or some other imaging studies done.
Menstrual cramps. NSAID’s, SSRI’s, hormone meds, OTC meds containing diuretics, warm bath, heating pad, exercise & acupuncture are excellent for PMS / period. Avoid caffeine, chocolate, alcohol & salt. Get GYN eval to R/O underlying pathology. Consider omega- 3 fatty acids, magnesium (supplementation or through diet) or Black Cohosh with dr ok. Sipping Chamomile can dissipate pain. Ginger helps w nausea.