I was so much activ during december, draw draw draw draw and draw and since 8 days, totally unable to draw anything....

This is the problem, you don't take any rest about drawing. ^^
Drawing is like physical activity (workout is the best example), you need rest to imrpove your art and to not fall into artblock or burnout.

If you can't draw anything, just drop the pencil for some days and do an another activity (videogaming, chilling, sport, reading....)

Ben quand j'ai des idées je me force pas, je les laisse couler, mais j'avoue que quand je dessine pas pendant une journée complète j'ai tjrs une sorte de culpabilité intérieure et c'est probablement ce stress sous jacent qui me fait perdre les pédales de temps en temps.

Art block, hits me like that as well, sucks it happens, so many good ideas, and literally no drive to draw them, you try, and get no where at all, erf.. yea, I know that feeling real well.

Art block sometimes comes when you force yourself of doing something. Just listen to some music and then slowly start doing something.

Ah bringing back the good old meme. I understand ,there are times you get going and are at it like crazy being proud at your works and then suddenly BAM!! No more energy or will for it. Take your time , the world isen't going to end soon or our lifetime anyway. Take a brake , game a bit and see what happens.

Creative block is the worst.

Heh - that's gotta be the most amusing way I've seen it put yet. :P

Well, look at it this way - you at least can draw really well, so once it passes, you can get back to it. It could also just be that you need to take a break. Trying to focus on one single thing too much makes it a lot easier to burn out. Play some games, or even pick up another project of some sort that you needed to do, then go back to the art, and keep switching it up a bit more like that to keep any one task from over-stressing ya. :)