Wow, get yourself checked out with the doc, to make sure it's nothing else.

I've had somewhat irregular periods for at least 1/2 of my "fertile" life and never considered birth control pills to regularize. It always amazed me some women I knew who could time the start of their period near the hr. of a certain day. If my body did, I was too absent-minded.

I've been checked by doc several times. I don't experience any pain during periods nor mysterious lump(s). My symptoms never became like yours and you are still "young"! Well, part of my cause, was I used to be slightly underweight or I was under abit of stress.