You can't "try harder" your way out of depression. You aren't doing anything wrong that is making this depression a problem for you. It just is what it is. I too had no problems at all taking wellbutrin. I went onto it and felt absolutely no side effects (I think as AD's go it's a pretty friendly one as far as side effects go). The longer you put off taking it, the longer it will be before you get some relief.

AD's will help lift the muck and the mire of depression so that your mind will work better. I think of depression as wading through quicksand. AD's help dilute that muck so that I can function more like the regular me. It won't solve your problems. You will still need to keep working on your issues in therapy. But it will make you more able to work on those issues because your brain will just be functioning better without so much depression weighing you down.

As far as eventually coming off the AD goes down the line, first, your doctor will take you off the meds when you are no longer depressed (for usually at least 6 months-ish). Which means, you won't feel like you do right now because you will not be this depressed. In the future, should the depression return, you will know that an AD can be helpful for you to keep you from suffering with this depression.

There is no magic pill. Even AD's are there just to help us. They won't cure anything. However, they can make our path to healing a whole lot easier and more productive.