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You have what's clinically called an:
Olfactory Nerve Disorder: this means that something has affected the main nerve responsible for "smell"...which is why you keep smelling 'exhaust fumes'.
Here's a link:
Here are some possible causes: [I believe the nausea & headaches are related too]
I strongly advise that you make an appt for a detailed exam by a Neurologist; he will probably order some tests [eg head CT or MRI scan] to help establish the correct Dx, and then start you on the approp therapy.
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Best Wishes for Your Health,
--Dr. Steve, (Your Online Family Doctor)