Hello and Welcome to HealingWell and the Depression Forum. I am Kitt. I know there are many people who have trouble getting onto the right meds and I went through a lot of them myself.
It is sometimes just a matter of keeping on. The newest antidepressant approved by the U.S. Food and Drug Administration (FDA) is Pristiq . I do not know a lot about this med but I do know it just hit the market. It may be worth discussing with your physician.
If you would like to share a bit more about what your going through we are here and more then willing to listen.