Thank you everybody for caring and your answers. I took good note of all of them.

The doctor sent me to take some X-ray photos, we'll see how it's going. No treatment (well, analgesics) until then.

Meanwhile, I'm trying to stay away from keyboard (and mobile phone) as much as I can, and when I'm typing, I take breaks many times. That's helping, I think. At job now I have some tests to do (basically, figure out how to get rid of our XP computers, wether migrating some to Win7 and some to GNU/Linux), so not much typing there either :)