This answer is classic for a person struggling with anxiety and OCD.

Checking your body temp is not necessary. Use common sense. If you feel weak and dehydrated, cool down, hydrate, and rest.

kom, Do you take any meds, like an SSRI? They can cause excessive sweating.

Simple water is fine unless you are doing physical effort for hours on end. Electrolyte depletion takes much longer than an hour of effort.