Sorry about your death- death is fogging painful on swamp sometimes.
Don't take this the wrong way, but there's a lesson to be learned here:
If you have not maxed out your armor skills- or nearly so, stay out of those higher end maps.
I have my heavy armor maxed out and last night, on sub3, my helmet broke, and suddenly I was taking about 5 to 10 damage a hit- so I can just imagine if you don't have enough points into armor, how much that'd hurt.
At the same time, they didn't come to you...you went to them. And aleways keep in mind that the game/maps are talored in such a way so even when you're lvl1000, it should still be fun. If the higher maps are toned down so a lvl60 with heavy armor can survive them, by the time you're lvl300, you run out of things to play.