So I Got the vampirism disease and slept once, so I had the first dream. Then I made a cure disease potion and drank it. However, I still look like a vampire and still have all the vampire attributes. But i haven't had anymore dreams either. And I'm not fully vampire because can be exposed to the sun...does it just take a while for everything to go back to normal or did I do something wrong??
If your vampirism has progressed to the point where you had the dream, you can't cure it with a potion or any of the other disease-cure methods. There's a quest you'll have to take to get a cure.
If you're on PS3 with GOTY, you'll probably do better just to load a save from before you contracted the disease, because the cure quest is bugged.