I went on birth control to make living out of a backpack for a year easier and have cramps be schedule-able... in my experience, I had very regular and predictable periods until I tried to go the last two months without having any period of all (i.e. not giving myself the week of fake pills) and eventually I bled without intending to.
It sounds like an abnormal experience, for sure, but I don't know that abnormal results mean a big deal. I'm unqualified to speak on the subject.
*You don't have a soul. You are a Soul. You have a body.
*Faith is the art of holding on to things your reason once accepted, despite your changing moods.
I don't have specific experience with Yaz, but having been on birth control in the past, and having friends who have been, it's common knowledge that lots of crazy things could happen the first several months. Spotting is common, as are weirder periods that might not follow your 'normal', pre b-c, ones.
That said, it's highly individualized from one person to the next, and it's equally possible that Yaz is simply not working with your body, and a different brand/method would be better. You could always contact your gyno (if you haven't already), as she might want to change the birth control pill. Different ones can have very different effects on the same person. I don't know what your gyno would say, though....she might want to wait it out and see whether your body doesn't regulate itself over the next couple of months...but really, I don't know...give the office a call!!
"...On and on and on and on he strode, far out over the sands, singing wildly to the sea, crying to greet the advent of the life that had cried to him." - James Joyce