Fibromyalgia. Pain in different locations, along with other symptoms. Localized pain could mean other things. Consult your primary care doctor.
Associated with. Pain in the lower buttocks, called sciatica, is a common concomitant of #fibromyalgia, with pain aroused by focused pressure on a "pain point" in this region. Imo, sciatica is from presacral plexus impingement by unstable sacroiliac joint; due to multiple childbirths, and/or joint hypermobility syndrome, and/or prior lumbo-pelvic mechanical injury.