I'm in the same situation as your girlfriend. I was on Estrostep for 2 years and my sex drive was non existent. The last few months I realized it was the BC so I decided to switch. You won't know if something else works unless you try it. I've been on the new BC for less than a month so I can't say it has made a difference or not yet but as far as mood swings I think it has. So consider switching BC it may help. The only problem I had with my BC was the sex drive problem also.

See now, here's a perfect of example of what I was saying about women responding differently to different pills. I, myself, never had a problem with my sex drive on Estrostep. I was on it for two years as well.