I've been yasmin for about 1 1/2 years now (I'm 21). Going to th...

Ive been on yasmin for about a year now and have only just noticed things are changing. I started yasmin beacause i was having painful periods and yasmin has most defianetly fixed that, however i have put on 6kgs in the last 2 months, i am quite moody lately and have been suffering from mild nausea in the late afternoon. Also my doc instructed me to skip the white tablets on the first 2 packs and then take all of the third pack, however when i skip the whites im having light cramps in my lower back and lower tummy and a browney red discharge it lasts roughly 3-4days, i was told this would eventually go when my body has adjusted, but how long will it take>? its already been a year....