I was on this pill for about 2 years & in the end I was advised to change it.
In those two years I changed into quite a moody person, I was emotional and cried all the time and went right off sex.
Whether it was to do with the microgynon, i don't know, but I changed pills a couple of years ago and feel alot better now.
I'm now on Marvellon, which they prescribe to people with bad skin because it's good for getting rid of spots. I haven't put on any weight at all since I went on it. The thing with the pill is that it just tends to increase your appetite, so aslong as you watch what you eat you should be fine.
I'd say give marvellon a go, as I felt the same as you when I was on microgynon and was also worried about the skin/weight thing.