Any female who is old enough to have her periods is old enough to need an ob/gyn. The ob/gyn who won't see her due to her age should not be considered as a doctor for her. Drop him! He doesn't want to help.
When I was having problems with what turned out to be endometriosis, medical doctors couldn't seem to find anything wrong, but my primary care, who is an osteopath (medical dr and dr. that uses natural treatments) was the one who found it. She also was the one who discovered the breakthrough last year. I've learned that taking pain meds before the pain hits worked better than trying to fight it until its too late (I'm a fighter). I used OTC pain meds though.
Also have read that prescription pain meds. stop working after awhile, because the body is determined to send the pain signal through, so it makes it stronger so that it overrides the medicine. That means more pain meds. are needed until eventually the pain meds. stop working completely.