If I even go near a chlorine or bromine pool I am sick for about a week. Thats just being in the same room as an indoor pool. The chlorinated air makes me very ill. We used peroxide based cleanser in our swimming pools and they make it for hot tubs too. I can't remember how to spell it. It's like Baquacil or something similiar. They make a formula for hot tubs too. I'm not sure of how good this is or isn't for a person but it allowed me to swim. I would not use anymore bromine if I am spending money on iodine. It defeats the purpose of the iodine.
Hopefully, someone with more knowledge will chime in soon.
Joy to you! HH