Welcome to HealthCentral. You probably already know what I'm about to say, but you should really see your doctor to have your seizure-disorder evaluated or to be tested for possible MS since it does run in your family.
The offactory hallucinations (odd smells which have no outside source) are a symptom of many different disorders which are related to or might mimick seizure disorders. You might find this article very interesting to read - Simple Partial Epileptic Seizures and The Nonepileptic Imitators.
Strange odors can also be caused by a nasal obstruction, lesions in the brain, lesions affecting specific cranial nerves, or even brain tumors. You should visit your doctor.
The pain, swelling, and stiffness in your joints could be symptoms of a rheumatological disease. Definitely tell you doctor about this as well. Some simple bloodtest might get the ball rolling on finding a possible reason for these symptoms.
Hope that helps and please let us know how you are doing.