What book was that? In The Cure for all Disease she says not to use baking soda because it contains benzene, a toxin. She instead says to use sodium bicarbonate by itself. (Yes, that is the main ingredient in Arm and Hammer baking soda, plus benzene)
A cranial guy also told me to use baking soda to reduce acidity, but knowing about benzene I didn't do it.
The sitz will take care of your night sweats mostly (it did for me).