I cannot tell you anything about the herb, because I only learned about it from you, but I can tell you that you need a p-doc=psychiatrist, who would be equipped to treat your symptoms. The general doc is not equipped. Psychiatry is a large body of knowledge. There are currently plenty of drugs on the market and they interact with one another like crazy at times. Lots of different side effects and ways to manage/counteract them whenever possible. It is just too much knowledge for a general doc to absorb. So please find yourself a psychiatrist.
Possibly even look for a p-doc who specializes in adolescents. I mean, 18 is still an adolescent to me

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