This may be a little random, but I have POTS, which causes dizziness when changing positions because the autonomic nervous system can’t adjust as it should to pump blood up against gravity to my brain and upper body. Anyway, one of the main treatments is increasing salt and blood volume through hydration with fluids and electrolytes.

Just thought I’d mention it if it might make a difference. But sounds like you’ve got a good plan in place already. After trying many, many different kinds, I settled on the brand Kinderlyte. It’s marketed to children but it has the correct proportions for an oral rehydration solution without any artificial colors, flavors or sugar substitutes…as long as you don’t need to monitor your sugar. …And it tastes good!