That sounds terrifying! I have had SP on a couple different occasions, and while they weren't that bad, they were pretty scary. For me, it always feels like someone has belted me down to my bed and there is this figure near my feet (although I never SEE it, only somehow KNOW its there). Sometimes the figure will start touching my legs, other times the expectation is enough to cause fear - either way NOT good.

I don't think I've ever felt PAIN in my dreams though, only discomfort. Well, at least you're fighting back.