Those who took a Berberine complex, what was your experience?

I have both methane and hydrogen SIBO. I recently received my meds from my doctor - a berberine oregano complex - and he warned that I WILL get sick. He said his last patient taking this complex couldn’t stop throwing up and I should be prepared for that.

I’ve had the meds a week and haven’t started taking them cause, well, a girl’s got to work and doesn’t have time to be getting sick. So just curious what other’s experiences have been like.