I really think that downloading hearthfire broke my game. I now have vampire attacks like what happens when the sun blocks out. I now have random thalmor on Castle Volkihar attacking me. There is a random sun in the sky that somehow is svcking light from no where and there are square patches of missing water in the middle of the ocean that i can see straight towards the underwater ground. I think my game is screwed. I have encountered the thalmor bug and missing water bug before but hearthfire has brought it back. The attacks stopped a long time but now they came back. And there is a random sun on volkihar castle that comes up at night and day and dissappears. Has anyone encountered these bugs before or after downloading hearthfire?? Please help me Bethesda.

Vampire Attacks - Dawnguard
Sun Darkend - Dawnguard
Middle Water Hole - Bug
Thalmor Attacks - Dawnguard maybe, Def not Hearthfire.. unless it's like your home idk

no not sun darkened! I said sun is out at night when i fast travel to castle volkihar. Then it dissappears. I KNOW the vampire attacks are from dawnguard except they have started again. I finisehd the MQ for dawnguard and the attacks stopped. Now they have started again since i downloaded hearthfire. The thalmor attacking is a effing bug and the holes are verywhere in the lake in the ocean everywhere!!! UGH!

Delete all DLC and patches, and re-install.
This works in over half of cases relating to such bugs you have described.

This is a new DLC, they need time to fix bugs. Also, the Thalmor attack randomly, it happend to me many times before any DLCs.

They don't patch DLC, iirc

they patched for vampire lord. anyway, I want to say is have you ever had a thalmor mysteriously appear everytime you fast travel to castle volkihar??? AND HAVE YOU EVER HAD A RANDOM BRIGHT BLACKHOLE APPEAR OUT OF NOWHERE WHEN YOU ENTER THE CASTLE VOLKIHAR CELL/???!??!?!?!?!??!! no? THEN I WANT TO KNOW IF THIS IS A BUG OR NOT!