On the PC/NA server when I get really bad lag, sometimes a relog sorts it. Perhaps it is because it is putting me in a different shard. Of course that does not always work, but usually just waiting 10 or 15 minutes and coming back into the game can help in that case.
Although a couple of weeks ago, it was really bad one night, but I never figured out if it was one dungeon I was in or the game as I quit playing after that dungeon for the evening.
Enjoy the game, life is what you really want to be worried about.
PakKat "Everything was going well, until I died"
Gary Gravestink "I am glad you died, I needed the help"