Irregular Menstrual Cycles: Seeking Advice

For the last few years I've been having very irregular cycles. I'll not have one for three or four months and then have one that seems pretty normal in flow and duration. But after that I'll bleed every other week for a few months. During the every other week phase the bleeding is a little different, it's not clotty but more like blood that comes from a cut, if that makes any sense. I think I'm approaching menopause but it still seems kinda wierd. My Doc didn't seem too concerned about me not having a period for months at a time, but she did raise and eyebrow at the every other week thing. I had a pelvic ultrasound done a few years ago and found some little fibroids, and just had another done today so still waiting for the results of that. Just curious if anyone else has experienced anything like this and what you've done about it.