If you randomly smelled something strange, I'd tell you go to the doctor immediatly because you may be having some of the beginning symptoms of a very mild seizure. Did your muscles feel tense and rigid during that time? Did you suddenly forget whatever you were doing at the time? Those are the most commonly associated symptoms. If it continues, I recommend seeing your doctor.
I suppose Hemophilia could be a possiblity, but the truth is, if you have Hemophilia, you would definatly have noticed by now. It's congenital, so it does not suddenly appear during adulthood (not quite sure how old you are).