Recent Blood test showing a PCA of 18.2

Well I recently rocked up for a blood test and they included a pca test which they don't always do,Anyway results came back and to say I'm on edge is an understatement.

Dead scared it could be cancer the only symptoms I have is erectile dysfunction which I have had for 10 years so i am not assuming that is a cause but I do have a slow pee flow but up to a couple of months ago 

it jumped between slow and fast.

I have no pains no blood in seamen or stools anyone else been in my boat?

just waiting now for my hospital appointment but the waiting is killing me