Robot First Person Shooter

I dreamed I was involved in a first person shooter that had one roaming around a large ruined city shooting at giant robots and their human controllers. I had a sidearm, but my primary weapon was a giant robot that I controlled with a game pad. A game, in a game.

I was having a great time taking down robots left and right, while my robot seemed to be nearly indestructible, at least until I accidentally stepped into a pit and my robot buddy stopped in its tracks, apparently out of range of the controller. The enemy bots made short work of him. I managed to avenge him, and one of the other players jumped down into the ruined basement to confront me. Our guns did nothing to one another, even firing point blank in the head.

I mentioned that this was a very frustrating game, since it echoed one of my nightmare frustrations - having a gun to defend myself and finding out it was utterly useless against a living antagonist. I woke up in a heart racing post nightmare state, even though I didn't really see the dream as a nightmare.