But there is one thing that didnt make sense is, under the quests it said retrive the horn and it has an X next to it..But when i went to wulfgar it said i gave it to him and he walked me over to teach me the word..Not sure if that has something to do with it..
If you pickpocket Arngier, do you see the horn in his inventory? Remember, Arngier, not Wulfgar. If he does, see if you can pickpocket it and give it back to him. Or take it, leave, come back and see if the quest restarts.
All my previous playthroughs, I never bothered to re-check the possessions of the Greybeards, so no idea if the item disappears or not from their inventory.
No vampirism and im not familiar with ebony mail
Well Vampirism or Sanguinare Vampiris, depending on what stage you're on does have a negative reaction to others you interact with. Double check your active effects to be sure. I don't know with 100% certainty whether or not the Greybeards would attack you on sight when you're suffering from Stage IV Vampirism, most other NPCs will.
The Ebony Mail has an AOE effect when equipped that inflicts poison damage to those around you.
... Leaving work for the day, hopefully you get this sorted out soon. I'll check back later this evening.