What Causes Lack Of Menstrual Periods And Frequent UTIs?

I am 21 years old and today is Feb 15, 2010 and i have not had a period since Oct 2009. I am not on birth control nor have i been for the past 9 months. Ive taken pregnancy tests, and it says negative. Ive been experiencing in the past couple of months frequent UTI's and have taken Uricalm, just something you can get at meijers, it helps the pain and makes it go away in a couple days, but i dont understand why i have them so often, and i would like to know where my period is. Please help!