So I'm playing Skyrim and doing the quest where you need to fetch a Moth Monk for the vampires in the DawnGuard expansion. THen I noticed my Health was 0 and after looking on the skill menu, it said 0/NaN.

Now I know NaN is Not a Number and wrote player.getav health in the console which yielded:
GetActorValue: Health >> -1.#J
Is there a specific command I can write into the console to revert it back to normal?

Also, the time has stopped. It is permanently Sundas 12.00 PM.

I run Skyrim with the DawnGuard and HearthFire expansions and also the HD pack which goes via Steam, so I doubt its the HD pack.