Could be a number of things....I have issues like that too....(going months without) but the pill can mess with your hormones and just jumping off it could have taken everything off balance, but depression and stress can for SURE do it.
But I'd ask the doctor to reffer you to a OBGYN to make sure it's nothing.
It could be endomitriosis, I have it...but I'd talk to your doc... :hug:
~Carolyn