Salamanda, your story sounds like mine.
I've had irregular periods from the start too. In my twenties more than in my teens I got acne. That and the irregular menses got me thinking I might have PCOS. When I received my diagnosis my bloodwork was fine except for an elevated LH:FSH ratio and some cysts. Later I went to another hospital where they told me I didn't have it because I didn't meet 2 of the 3 criteria necessary to be diagnosed. Although I do have (1) oligomenorrhea I did not have 'enough' cysts on my ovaries (but that's debatable, how many you need) (2) and (3) my androgens were within normal ranges and I did not show bad enough acne or hirsutism. I'm a thin cyster like you and I eat pretty healthy. I think if I didn't my symptoms could have been worse.
When I found this site I did some research and I found out that pcos works in a different way in thin cysters than it does in 'regular' cysters. Here's the link to an interesting article I found here:
Pcos Treatment - Non-obese Women
It says that with lean pcos you can have relative hyperandrogenism. That means that your androgens can be within normal ranges but because your estrogen is (or once was in your adult life - because of too much exercise, anorexia etc) low it leads to a androgen:estrogen ratio comparable to what you see in typical pcos, even though bloodwork suggests everything is normal. Could you post your lab results? I could have a look at it if you want, and you may want to read this article too:
Guide to understanding Lab Results for PCOS...what if they're "normal'?
It states that what is considered normal may not be desirable. If you're on the high end of normal with your testosterone levels, you could still have unwanted effects (like acne)
I hope this helps! And if you got any questions, feel free to ask!

__________________
Me: 25 DBF: 29
Dx October 2008
thin cyster: oily skin, thinning hair, mildy hirsute & irregular periods
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