You may find this useful. They should have given you a diagnosis, as there are several causes of Vertigo.

Vertigo - NHS Choices
Epley Maneuver and other Home Remedies for Vertigo

 

I had that when I had an operation on my ear, next morning wake up and forgot about the op. I sat up too quick and tried to get out of bed. Room spinning around next thing I'm flat on my back feeling like I'v drank a full bottle of whisky. Anyway went back to the surgeon and he did that Epley maneuver, which worked, told me some bits in my inner ear was doing that.