St John's Wort a personal favorite of mine apparently this herb has two chemicals specifically counter depression. Hypericin and hyperforin act on chemical messengers in the nervous system that regulate mood.
Chamomile also has compounds that bind to the same receptors as Valium.
Valerian helps with sleep , I tried this in a pill form when I used to have sleep issues. There are more out there but these are the few I have definitely tried myself.