What Causes Irregular Periods And Severe Cramping During Periods?

49 yo female: last 6 months periods have been irregular including spotting for days before, cycle going from pretty normal 28-29 days to a) 50 days (skip essentially) b) 26 days c) 22 days d) 27 days e) 24 days Lower left around the ovary, has been achy to painful for the last three periods. Cramps have become quite severe in last couple years. And tonight I noticed my cervix is swollen. I am currently in the middle of my period. Any thoughts what could be going on? I will be seeing an ob/gyn in 10 dyas after my period ends. HISTORY: menses at 10yo, sexually active from 19yo, had genital warts at 23 yo which were laser removed, not recurrance. Contraception: pill 19-29 yo (partner had vasectomy), no children, all normal PAPs. Rarely had cramps until early 40s. Nothing else to report until about 5 years ago when extreme flooding started every month (I use a cup now and typical periods range from 100 ml to 180 ml). My GP recommended 2.5 years ago to get an ultrasound to check for fibroids. It came back negative. Flooding and severe cramps continued until about 6 months ago. Then the periods settled to 60ml to 90ml, cramps still severe lasting 24-36 hours. Manageable with OTC Pamprin. OTHER: Diagnosed with pre-diabetes at 45, managing with exercise/diet. HBP diagnosed 48, managing with Benicar HTCZ. Height 5 4 Weight 190 CURRENT: My activity level the last couple years plummeted due to family illness and being a caregiver. It has been on the increase for the last month. No injuries or excessive work-outs that would cause lower ab pain at such specific time/place.