I did not read ALL the posts here but I have PCOS and before I was diagnosted I would go 6 to 8 months without a period. WHen I was younger my doctor always told me "some women are just like that" so it didn't concern me. Until I got older and just couldn't lose weight even with a personal trainer and a strict diet from a nutritionist. At that point I went to my doctor thinking it was a thyroid issue and low and behold PCOS came out of it. It explained a lot of things including the irregularity or lack thereof in my cycles.
Good luck and glad to hear you got ia visit from your "Aunt Flow"! ;-)
xoxo,
-Nadirah