What was going on when you left?
Just guessing a time, Titans East was attacked by mirrored versions of themselves from an alternate universe.
A mysterious organization (Seth) has been selling Venom, a drug which doubles your strength for about an hour. However, anyone who uses this drug will be subject to mind control by Seth sometime in the near future.
Hollowman tried to summon Trigon, and both Titans teams worked to defend Raven. It was a hard fight with lots of sacrifice, but in the end, the Titans were successful.
A new rising force in Jump City is the Night Hawks. They don't agree with the Titans way of doing things, and the two will meet in conflict sometime soon.
The Argo fight has now begun.