What is created when "Iron-Out®" is mixed with household bleach?
Good that you left for fresh air.

Assuming it is the same product I know, it calls here for caution:



The below mentioned data safety sheet available (SDS) here mentions for the very product as composition



and recommends as first aid (same source):



Upon the action of bleach, you likely generated sulfur dioxide, gas with pungent smell. Refraining from a remote diagnosis, but if you accident happened in a less ventilated space and you inhaled a lot, consultation of a physician may be adequate as sulfur dioxide ($\ce{SO2}$) is harmful and maybe you equally inhaled vapours of bleach, too.  Likely, mixing "iron out" and bleach together yielded a considerable heat, too.