pool guy put bromine tabs in my chlorinator

Hi,
I have a 20,000 gallon gunite pool in SoCal, Riverside. The CYA levels were high, and the pool man put bromine tabs in my chlorinator. I didn't notice until the water was getting all foamy.
I took the tabs out, and shocked the pool. I don't know what to do. Is it possible the Bromine levels didn't get too high, or am I doomed? Thanks. Any help would be appreciated.