I was exactly the same as you apart from I was changing from Rigevidon to cerazette. I changed for family history reasons rather than dizziness etc. When starting cerazette I bled for 3 weeks! It was awful but my GP said to hang in there and that it should wear off.. which it did. After that I then had two normal periods over 4 months (so every other month). Since then I have had no bleeding whatsoever and its been a Godsend. Plus its much more safe than the combined pill so helps with my hypochondriac/anxiety tendencies.