Turns out calcium does smells AND seizures in the same article! You're on to something!

"CALCIUM MAKES THE BRAIN STRONG

Interestingly enough, calcium is required not only for normal neurotransmission and smell; it also plays a role in blocking persistent smells. After a few minutes of being exposed to an odor, extracellular calcium enters olfactory neurons and prevents them from sending signals— turning down the volume. It would be interesting to study if the sense of smell differs in bipolar patients.

Calcium channels also play a role in other sensory neurons in the eye and in the ear. Studies in salamanders and mice show that low extracellular calcium increases calcium signaling between neurons in the eye as well as in the nose. What effect a drop in extracellular calcium would have on vision is uncertain; it cannot be completely bad considering that artists have 20 times the rate of bipolar disorder as the normal population.

Also, at least one type of calcium channel seems to have a role in synchronizing brain cells. A type of epilepsy that sometimes occurs after a stroke has been directly tied to increased extracellular calcium, probably by leakage from dying cells. Epilepsy occurs when a part of the brain strongly synchronizes its firing. Omega-3 acids, which play a protective role against depression, have recently been shown to control calcium channels and other ion channels also involved in our senses, further suggesting that diet SHOULD play a difference in bipolar disorder management"

taken from : http://www.csa.com/discoveryguides/bipolar/overview.php