I have this reaction, but only when returning after a hard run. No exercise? Totally fine. Smells like skunky basil. If I've been on a run? Nausea, headache and

I have this reaction, but only when returning after a hard run. No exercise? Totally fine. Smells like skunky basil. If I've been on a run? Nausea, headache and it smells awful.