You've never heard of the infamous "miss three liturgies in a row and you're excommunicated" rule? I have no idea if it's real, but it's been floating around the interwebs for a long time...
It comes from Canon 80 of the Council of Trullo in 692.
IF any bishop, or presbyter, or deacon, or any of those who are enumerated in the list of the clergy, or a layman, has no very grave necessity nor difficult business so as to keep him from church for a very long time, but being in town does not go to church on three consecutive Sundays--three weeks--if he is a cleric let him be deposed, but if a layman let him be cut off."http://www.fordham.edu/halsall/basis/trullo.asp
There are many canons from this council that have become the de facto norm for the Orthodox of today, while there are many that are not strictly enforced. It would be best to get specific direction from your priest about the issue to see how he and the bishop apply this canon.