Chlorine + Bad Ventilation

I have a question. We're in a bubble, mostly in mornings and afternoons. It isn't exactly the best place, but whatever. We have trouble with ventilation, and we've improved some by putting tubing under the seam of the bubble, leading to the outside. We uncover these as we need to. Over the weekend they shocked the pool with a chlorine dosage instead of a non-chlorine dosage. We swam in the pool this morning, anyways. (We're hardcore like that!) Well, most of us developed breathing problems and uncovered the caps. Still, the symptoms prevailed. Most of us left the bubble for air, but still returned to finish our practice; personally I didn't leave. Talking to my friends today, after school, we all still had bad problems regarding breathing. We all can't breathe deep without hurting or coughing, and we're always gagging from time to time throughout the school day. My question is: Does anyone know how to rid of these symptoms fast? --Arojekt.