Gaba is a great supplement.
How do you know? You say you take it with a load of other supplements - any one of which could be causing the effects.
I was about start SSRI's antidepressants, (pharma will kill you, is a big business).
Yes, it's a big business, so they'd hardly tolerate killing their best customers. But accepting that some people who take their products do die, so do some of the customers of small pharma, which produces these supplements.
But if you find small pharma products help you, that's great.