I agree with discussing this with your doctor. Anti-depressants are very complex medications that interact with each person's chemical balances in a unique way. What works for one, may not work for another.
Make sure your doctor understands how important your craft is to you, and that finding a medication that will work both to make you feel better generally AND allow you to keep your craft is of the utmost importance. There are a lot of great doctors out there who will get this right away and work with you till you can come up with a good solution. Make sure that you have one of those great doctors. You (and all of us) MUST be our biggest advocates when it comes to our health.
Other than that, try different stuff (I would say), and if it works for you, great! If you try something that doesn't work for you, well, that's fine too. At least you will be doing something. Then try something else. If you begin to feel frustrated/more depressed/angry with your writing or any new thing, walk away from it for awhile.
Also, it may sound stupid, but exercise to an appropriate & comfortable level seems to be of great benefit to many people. It helps to modify the way chemicals are produced, released, and accepted in the brain, so it might be worth a shot.
Mostly, though, do what works for you and keep chugging. EVERYONE has downturns in their lives. It is normal, and no-one should be feel alone or embarrassed if they're having a downturn. Just posting on craftster is such a healthy step! Way to go self-awareness.
God, this sounds hopelessly social workery. I need a new job. . .