Writer's block

It seems it's here again... The feared writer´s block. And no, it's not the usual "I don't know what to write", not, that would be to easy. It's the dreaded "I know exactly what to write, I have around ten things to write, I know where they are all going but when I open the document there is a block"-writer´s block. It's so real I can almost touch it. I don't know why because I started on them not to long ago and I really want to write on them but I can't! It's not good, I'm breaking a little bit inside every time I have to close it again without getting even the slightest sentence or even word written down. It's so frustrating! I know where I want them but they're not going to write themselves there now are they? Tips anyone? should I force myself to continue or... Kill my darlings? No, I couldn't possibly....  I really am desperate. Even if they aren't here I still know it would happen again.