I get brief headaches 2-3 times a day for a few seconds. i occasionally smell things that aren't there, and have minor muscle spasms every week or so?

Smelling things: that are not there ? Muscle spasms every week? Perhaps you should have an EEG performed and see a neurologist. Olfactory aura's preceding secondarily generalized seizures can occur in isolation as simple partial seizures or may go on to become partial complex seizures if consciousness is briefly altered. Sometimes special EEG techniques are needed to detect seizure spikes (naso-pharyngeal leads)

Need to be examined: You would benefit from a visit to a neurologist. Olfactory hallucinations aren't as related to headaches as they are to other problems that should be looked at. If the headaches you are experiencing are brand new then, they may be related to the smells. If they are more historically posed then, they may be a separate issue but actually do have specific & effective treatment.