Your medical mystery that started at camp sounds like you got bitten by something and had a virus or protozoan infection from that.
Chronic fatigue is often related to mosquitoe born viruses.
Excessive thirst can be diabetes, kidney problems, a fever or an infection.
A lot of these things don't get picked up by normal tests and you have to specify mosquitoe born virus for a test to be done on that. In addition, a lot of viruses and protozoan infections are still unidentified so even if they do test for mozzie bites, they might not know what it is because it's new to science.
Giving birth can trigger allergies so a major incident like your camp issue could have triggered some of your allergies.