the game is still "young" aka not that patched so they make it more hard after some time.
Some quest are bugged as well, the graphics are great, for those that ever have seen the nord lights in real life and them see them in skyrim i gotta say its pretty well done of them.
Its very similar to what you can see in north norway if you are lucky, you will see a lightshow like no other in life.
Anyway, RavenousRat says raise difficulty level.
Might work i only played normal so far, died two times. 1 time from falling off a cliff(This nord can fly god damn it) and once from rushing at a frost troll like a pyscho tank build

I think as before for morrowind and oblivion mods will fix it.
Still to early to say, as patches aint done yet