Poor Nebo... Poor Amy...

First guess would be the Boy is <munchin> on something
he probably shouldn't be!

I'd call the White Coat and explain everything you've observed -
and ask for suggestions.

The Vet may want "samples" (uggggh!) - be sure to ask how they
want them "stored" (fridge or freezer??) and how long after you
"get" the sample you can store it before delivering it for testing.
(I can't remember - but "pooh" has a life expectancy -
wait too long and they can't rely on the test results.)

Nebo ~
Sorrie you feelin poorly ...
Please Feel Better Soon!!

/s/ Phred and the FurKids
.