I put cholorine tablets in my spa by mistake, now it smells toxic, I can barely go in my part of the home where the spa is. How do I get rid of the smell minus having to drain my spa again?

There is no way you are able to neutralize the chlorine from the existing water. You will have to drain and clean and refill.

Tick

If you stop treatments and wait a few days uit will dissipate on its own.

Hydrogen peroxide will neutralize the chlorine.

Add a chemical called thiosulfate