Ok, I have an interesting thought to add to all of this. I was diagnosed with Autoimmune Encephalitis after my 5th hospitalization since last May. Now this is something that people with strong immune systems don't get; and my age is 73 which may play into some of it. Still, electrolyte imbalance also plays a role.
I do want you to know: I was also hospitalized with a bowel blockage during this time. One of the Dr.'s mentioned this could be caused by an electrolyte balance and since AE can be caused by the same thing, this caught my attention.
I would suggest that you cut down on your water, and drink something like Gatorade (you can get a light version of this without all the added sugars, but bear in mind that you do need some sugar). This business of being told we need as much water as possible has caused a lot of people to get in trouble. We also need salt, sugar and a few other things to balance out our electrolyte losses. My lips were dry all the time, too, and I finally found a product called Lansinoh (on Amazon...seems expensive, but a tube lasts forever), that seems to help with the dryness.
The people urging you to use Gatorade, or I've even been told Smart Water, are correct. It's very important to keep those electrolytes balanced. Please just don't overdo it....Smart Water can be homemade with cucumbers and lime, probably some salt unless you're putting that on your food). Watermelon is also good for holding in electrolytes and helping to produce them. Just don't eat it past 3:00 p.m. or you'll be up urinating all night. If I find anything else out about electrolytes, I'll let you know. The advice about drinking too much water and cutting back on salt is fine....it's just that the habits of the patient should be checked out in addition.