"i had been taking yaz for about 2 years then had to stop since i was switching jobs and lost my insurance for a few months.  when i first started taking yaz i noticed much lighter and shorter periods, no noticeable weight gain/loss, no mood swings or craving.  when i started taking the generic pills i felt the exact same and chalked it up to taking yaz for so long, except when i recently switched back to yaz my breasts were tender and a few days before my period i had bad migraines.  i really didn&#039;t think to relate these to yaz until i read some of the other posts and heard of the side effects."