I was diagnosed with a pituitary tumor 3 yrs ago...not sure if that anything to do with what Im going through........

For some years now, I have awaken from my sleep with what I call tremors or shivers...It;\'s happening more and more often. I can't really move and it's a very strange feeling, at first I was freaked out cause I though my bed was shaking. I was able to rock my foot and moved my bed and the trembling is defintely not my bed, it is just my body. I ran into "parkinson's disease and to my amasement have alot of the symptoms. But is this how it starts, could this be something else? It is very frightning when you wake up and can't move and your body is shaking uncontrollably... I also get chills even when i'm a comfortable temp. Anybody??????