Hi Tara,
I definitely think your adding something new and major like those baths can cause your new mystery symptoms. Definite correlation. Especially since the baths are quite dehydrating, if you aren't replacing the fluids in massive quantities, and electrolytes as well, then you will experience nausea and dizziness. Not only that, but you will be stirring up toxins and people feel bad when they are zooming about unbridled in their body.

Sorry, I myself did not experience those symptoms.

You didn't ask for suggestions but probably cutting back to 1 bath a week for a while, and drinking an extra quart of water immediately before/during/after would help.
Don't forget, if you want to detox that just baths won't do the entire trick. You need to cleanse the bowel and liver, etc.