Viral meningitis. Been there, done that.

I ran at 105 F for a week before I drove myself to the ER and checked in. The hospital did the same thing, did a million tests, ran up $10k in bills and did.....squat, nada, nothing to cure me. It's viral so I just had to wait it out. But a huge reduction in malaise was had by IV fluids. The fever leaves you seriously dehydrated and that is most of the crappy feeling. If you can occasionally get a local doc to pump you up with IV fluids you'll feel lots better as you convalesce. It took weeks to stabilize and longer to get strong. I lost 30+ pounds over the course of the illness. Not a recommended diet, however.

Put a tarp over the boat and lay low for several weeks. Good luck, Timbo. It may be a slow road back.