Other than wait for CS, there isn't anything you can do.
I had this happen a couple years ago on Belsavis. I was in a phased area for a class quest and was disconnected. When I came back, I was outside the phased area, the screen was red, and there was no long any class quest in my log at all. I went back to the quest giver who wouldn't speak to me. So, I waited about 4-5 days for CS to respond. They bumped me just past the quest that disappeared.
I hope you get it taken care of quickly but it will take at least a few days I bet.