facial tics and too much Cal- Mag?

A few days ago I started an intense vitamin- mineral regimen to deal with a recent flare-up of CFS. I have also developed a facial tic below my right eye. I have read that a calcium and/ or magnesium deficiency can cause tics, but can too much also cause it? If not, what other supplements can cause this? The tic is definitely related to the supplements, I just need to figure out which one and adjust the dosage.

thank you sleepyheadgirl! I have cut back to 1/4 the Cal-Mag and the twitch has gone away, although my chiro thought that they couldnt be related since Calcium relaxes the nerves. Im seeing a new endocrinologist next week so we'll see what she says.