I had the same thing happen to me at Daytona.
After practice and qualifying I got so sick my head was pounding that I did not go out to dinner with my crew.
Next morning I was fine.. tilll after the race I was battling with a quick RX 7 from Miami that was spewing flames every time he let off. I would get him in the infield and he would pass me on the high banks.
I never put the two together
o.b.