Sorry if I'm a little late for posting this, but I don't like leaving questions unanswered.
My guess is that you just lost your muse. It happens all the time. When I was six years old, I fractured my left arm. And since I was (and am) left-handed I couldn't draw for a long time. Even though I got better I still couldn't draw anything. So I started doing other things with my spare time. One day, lightning struck me with inspiration and I drew three pictures with crayons that day. No joke.
My advice is don't just force something to come out. Give it time. Do other things as well. Read a book, play some games, *coughcough*listentoPotF*coughcough*. Explore other kinds of creativity, so long as you are willing to, of course. I'd suggest the Japanese art of paper folding. (It's called Origami, by the way) It may be frustrating as hell, but once you finish it, you actually feel quite proud of your accomplishment. Oh, and start out simple. Probably the Crane is best.
I hope this info was helpful!