Irregular periods - Anyone else???

So I've always had irregular periods, very short 10-12 cycles. This month has been crazy and I am now on cycle day 29 and still not a period in sight. I went to the doctor about my irregular cycles so she checked my hormone levels and I came back normal and she is blaming my irregularities on having been on the depo shot. However, I went on the depo becuause my cycles were so irregular, which she knows but she said I need to wait it out a few more months. Easier said than done! 
Very frustrated and just want to be able to track my ovulation. 
Has anyone's cycles changed drastically like this??