Please don't get offended here, but what you're experiencing is anxiety-driven paranoia. All this stuff IS making you sick, but not because it is harmful - rather, because you're EXPECTING it to make you sick and getting all nervous about it. What it does is give you the reverse of a placebo effect - a release of histamine in response to something freaking you out because you THINK it might harm you.
The solution? Anti-depressants, muscle relaxants, tranquilizers, or allergy meds. Just don't get behind the wheel when on the latter three.