Diabetes sounds quite unlikely, given all that. But still possible, I guess? It's a bit alarming that you're fainting, but have to wait a week for results. You could hurt yourself, fainting. And untreated diabetes can do lots of damage.
To test properly for diabetes, they'd want to do a fasting blood sugar, at least.
I'd consider A+E if it gets worse before you have results.
(Am Fanjo etc)