There's been many reports over the internet about a bug that causes massive health loss upon leaving the Dead Money DLC area, back to the Wasteland. I didn't notice it at first, as I had tgm enabled, so I could carry out all the gold bars. The game seems to think that I'm still sitting in a gas cloud and lowers my HP accordingly. I noticed the bug when I took god mode off, after dumping all the gold in the BoS stash.

Some kind of fix for this asap would be great. There's a lot of people suffering from this bug and I, for one, would prefer not to have to create a new game and start from scratch.