...I doubt we can ask the Arcana to administer the drug in my absence, so one way or the other, I expect we'll find the answer soon enough.

I'll... take precautions before the jaunt. I can lock away most of my psychic and magical abilities - as well as the memory that I had them in the first place - and set a contingency to unlock them if I'm investigating, or a full day into next liminal space if I'm not. That way, I'll be much less of a danger to those around me if the disease progresses while we can't reach my body.