Barfing almost killed you? That's a bit of a stretch. Anybody who ever had a GB attack has experienced exactly what you have experienced. It does feel wretched, but killing you? Puhhh-leeze. Let's not get hysterical.
What probably has come closer to killing you than a flush is clogging up your liver/GB in the first place. How else can you get a GB attack?
I know a guy that can guzzle 12 oz of wheatgrass juice, and he does that every day. You try that and you'll find out once again how congested your GB and liver are. You have an illness - a chronic illness - and that juice will lay you out flat on the floor and then shove your face in the toilet. This is called a cleansing reaction, but others prefer calling it a GB attack. Whatever!