I second the trazodone. My TCA was causing me pretty persistent insomnia even after a few weeks, so trazodone was added in at 25-50mg at bed time. I find that the calming effects last well into the next day, but do not feel sedated. Dare I say, it feels more effective to me for my anxieties than the main antidepressant. If you are one who wakes up with their head all buzzing about you may find trazodone helpful.
Also, I find that antidepressants that are generally considered "sedating" often cause me sedated feeling when trying to be awake and an inability to enter deep sleep at night. In my opinion, this is probably an overlooked yet significant contributor to the increased anxiety when starting an antidepressant.