I'm having a bit of a problem with the dragon at shearpoint. I found out that Krosis was too powerfull for me and decided to only kill the dragon. Unfortunatly, once the dragon was dead his body landed right next to the tomb of Krosis. I realy didn't want to fight the dragonpriest so I left. But now, every time I return to shearpoint, there is a new dragon that won't die. Every time the bloody beast lands/comes near me I absorb it's soul making it skeletal. As a result the dragon keeps flying around and attacking me as if nothing has happend. The problem is that he won't die once this has happend.
How do I fix this?
I tried keeping the dragon from coming near me and killing it with my bow from a distance but this is nearly impossible as the beast sometimes flies right over me. Loading a savegame isn't an option either because the time I saved before killing the first dragon was weeks and weeks ago.

First, relying on one save for this game to cover weeks of content is not a good idea, as you have found out.

Second, it sounds like you have created a Dragon Soul farm and personally, I would not be in a hurry to fix this, at least until I have some Dragon Souls gathered.

Third, the only thing you can hope for is the cell resets after 30 days (since you have not cleared it) and all this goes away.

Unless you are on the PC, you might be able to disable the dragon in the console. Still, even then I would keep this situation, spawn the darn mask, and farm some souls so you can use the Dragon Souls to Perks mod.