Thank you everyone. I appreciate your prayers.

The doctor thinks this is some weird virus I picked up on the cruise, with the bad cold making it difficult to fight off. I'm still feeling somewhat unwell, but at least am able to keep food down.

The main reason I went to her is that we're heading to Cuba soon, and I need to be sure this isn't bacterial, because it's often impossible to get antibiotics there. We take lots of OTC stuff with us (and whatever we don't use we leave behind with the local doctor), and most long-stay tourists bring a supply of antibiotics "just in case" (and then leave behind if unused.) My doctor won't prescribe anything for "just in case", but normally it's not a problem because my immune system is strong enough to fight most things off quickly and without meds.

This level of physical unwellness is unusual, and rather debilitating. Hopefully all that vitamin D and fresh salt air will help.