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Well, if you're a sorc, that's why you're dying. They can't take dmg until later levels when you get good gear. As of now, just keep pots handy while killing them as fast as possible.
They're separate executables (and obviously in a multiplayer game, things would be incompatible with other players), so no, you can't play with them unless everyone decides to use the vanilla game as well.
... actually, thinking back, the expansion might just install over the original game. You still have no way of playing with vanilla players, either way.