Hello, I suffer from the darkness also.
You will want to research online for a FREE Hospital with FREE Psyc Meds.
Yes SamE, St. John Wort, B Complex, Caffine Pills, Kava Kava all can be temp solns, but it sounds like you may need the pharma level of meds.
Then I recommend step 2 building out your social support system, friends (free), Councilors.
Then maybe work with self help from the library tapes or books to ease the mental circular dark throughts. yes it can be a challenge however, your worth it.
Good luck, be well!