This does NOT sound like a cognitive (“thinking-induced”) depression, but only based on what you wrote. Sounds more like chronic autonomic dive into relentless parasympathetic pitch that is characteristic of classic, negative symptom sz.
I’m going with Sarcosine and Abilify here unless or until I hear something different. And I would suggest follow-up appointments at two weeks, four weeks and eight weeks.
BUT… have you been on anti-depressants? Did they do anything at all?
Have you been properly assessed by a board certified psychopharmacologist? Have you read this book?
I would advise caution with cheesy stimulants like caffeine or taurine, let alone cocaine or amphetamine, as they will all make parasympathetic “dive” far worse in the long run.