Everybody who has written professionally has had writers block.
There are lots of things creative types do to overcome writers block. The best thing you can do is get your head away from writing and do something completely different like go for a walk or visit a friend, maybe play a video game. Maybe there's something else on your mind that you haven't been attending to, something more important. Whatever it is, getting away from writing will give you a fresh perspective once you get back to it. You can't force yourself to write, it comes to you.
No problem. :D
It's when you're normal hand for writing isn't working?