Could be. And I guess you can count Shifts as sickness too.

But I hope it's nothing serious. I remember this one time I got Shifted, and I started acting like a total zombie. I was all spacey, and I could barely form a complete sentence. Even if there aren't Malnosso yet, that doesn't mean it couldn't happen.

I definitely feel weaker, though. My Firaga spells are barely stronger than a regular old Fire attack.