Ooops, somehow I managed to forget answering Kris' adivise... and now I've to answer two posts!!
Kris: I think I'll wait until next time a "blood donor bus" stops by my city. They do quite frequently (two or three times every year). Next time, only wish I'm not taking anything that prevents me from having my blood taken!
Markus: Naaah, I'm taking the pills because of gengivitis, nothing serious (at the moment... but it have to be treated, as it's been too long I've had it). I don't feel anything bad, only that I can't drink my usual cup of red wine at some dinners...