hi, since early childhood i have experience left pelvic pain where i experience pain standing or sitting, sexual intercourse can be painful, pain in left pelvic area during urinating or with wind pains, my periods are regualar and i have not been on the pill for over 2 years . This pain can last all day and be gone the next day but keeps reappearing. i recently underwent a pelvic examination , also a vagina examinatiion and the results was a 20mm thickening of the lining and collapsed follicles, would any of these cause the pelvic pain. i now have been told to have another ultrasound the day after my next period finishes to check the thickness of the lining, what are they looking for or looking at?