The combination of valerian and St. John’s wort[hypericum] seem to work well for depression and to be even more effective than diazepam for anxiety. [I find this myself hard to believe knowing how efefective diazepam[valium,assival] is against anxiety.
According to Mills & Bone the combination have far fewer side effects compared to pharmaceuticals.[This I easily want to believe]
Don’t stop suddenly diazepam, this can give extreme withdrawal symptoms. Discuss it with your doctor