I also suggest getting your Thyroid-Stimulating Hormone (TSH) levels drawn. The blood test would show either an over (hyper) or under (hypo) active thyroid. My daughter has been suffering with this since she was 16, she is now 30 but still has to be checked and have her Synthroid (medication) adjusted regularly. Check out this site for more info on Hypo and Hyper thyroidism. http://www.webmd.com/a-to-z-guides/thyroid-stimulating-hormone-tsh
Good Luck and Good Health to you.
Hi there and welcome. ugh, sorry to hear this. When I was in my 20's, I had hypothyroidism or a slow thyroid as well as I produced too much estrogen. This caused my period to actually only come once every three to four months. BuT< I'd get PMS at the regular time and then suffer it all the way until my period decided to show! Really a rough time!!
My hormones regulated on their own without medical intervention (IE: drugs) but was working with my doctor on it. I was close to beginning medication to regulate things but didn't.
They may decide to start you on the pill to help regulate you.
Our hormones can be wacky and just get out of sync. Still never knew what threw mine off. However, there is some theory regarding a slow thyroid and mild depression. If you are mildly depressed, you often have hypothyroidism and if you have hypothyroidism, you often become mildly depressed. I worked on the depression angle---- briefly took a low dose of an ssri during this period of time in which my periods were irregular. I really don't know if this is what helped correct things for me. It's all just theory but interesting none the less. Any low level depression going on with you??