What are some good mood stabilizing and creativity enhancing herbs?

I have slight mood shifts, where I feel drained and negative. Any suggestions? I have tried St Johns Positive Thoughts Formula made by SourceNaturals BioAlign. It has GABA, Valerian, and St. johns wort among 20 other vitamins and herbs. I think it works, but if you have any other suggestions, that would be great. Chamomile I know works great for bedtime.