Is you just stick to certain feeds (morning, bt etc) then I think your supply will regulate but that was the point where my supply gradually decreased and decreased - C was older though so maybe that had something to do with it?
It's hard isn't it, if I were you I think I would just feed, feed, feed as much as possible whenever you can to try and get your supply back up. I know it's awkward at work but is there any chance you could express just for a week or so until you can get supply back? It may decrease when you stop though? Sorry not much advice, just thinking out loud!