Going through intense lower back pain and bloating after 2 days into my period. Never experienced these for last 8yrs.

PMS. Your pms can be accompanied by UTI if you are having urinary frequency and cva tenderness in the lower back.
Dysmenorrhea. Sounds like time for a gyn specialist checkup. Worsening pain with periods can be a sign of several different gyn problems, such as infection, endometriosis, fibroids, polyps, or cysts.