Drugs are bad and only idiots take them. I'm aware of this

But on many an occaison now I've vomited up pure black liquid after taking a few pills. It doesn't happen if I take one or two, only when I take a few. It's literally like black water coming out of me, and it tastes super acidic. As soon it's out, I immediately feel fine

Anybody ever had this? Is stomach bile supposed to be black? Maybe I'm just chemically imbalanced or something?

Nobody I know has ever had this. It's not worrying me too much, but I'd quite like to know if it happens to other people and it's not really the kind of thing I can stroll up to a doctor and ask them