Of course, this sort of thing affects creativity, affects the work. I try not to let it too much, and it does become a matter of powering through and just getting it done. Which I've been making a point of doing, even if right now I'm highly medicated and a little out of it. The point is I need to focus on the work, I need to get it done, because... well, not doing it is worse for me, emotionally. A few days without writing or other creative work, and I get very testy. That was the worst part of that vertigo bout-- I literally couldn't work. Eyes couldn't focus. I couldn't do much of anything but lie in bed and watch West Wing. It was terrible.
So thus I stay highly medicated right now to avoid that. And keep working. Which I've been doing: manuscript delivered to my editor this week. Now onto the next things.
There's always the next things.