I do take Aspirin specifically to thin the blood for this event, but I can't speak to Ibuprofen Vs Aspirin.
I can add to the previous comments that Emotions DO Run High At Altitude. It's a fact. Virgin Atlantic has warnings before even innocuous movies on their Trans-Atlantic Flights that you may simply be more emotionally reactive due to the Altitude.
Attitude above treeline, especially with the fog of Altitude closing in, everything seeming SO bright, or as you become increasingly Ataxic, is important. Thankfully, there are a lot of ways of keeping your head in a good space.
Positive Mantras, enjoy the scenery, maybe even fall temporarily in Love while you're up high on the trail. Haha. There's no reason you can't USE that emotional "Boost" to your advantage. Have some fun with it, by keeping it positive. Although I might recommend that if you do Fall in Love, just keep your mouth shut!
Now if you've got time goals and you're used to just gritting your teeth, yelling at yourself, and limping like Festus... you're on your own! Ha. Otherwise, relaxing during this race and staying positive is actually the best way to both finish, if that's your goal, AND to go faster.
Best of Luck!