Depending on how comfortable you are with others controlling your character, you will choose a strand of the Vakaton Virus. Your character will fall ill to that chosen strand after 7 IRL days if you don't post.  

Strand #1 puts your character into a coma like state. No one is allowed to control your character in any way. When you resume posting, you will wake up in a hospital. 

Strand #2 will turn your character into a vicious killing machine. Others will control your character but with only that one goal in mind.  

Strand #3 will let the first person that posts as your character control your character however they wish till you return. There will be some sort of limitation of course. 

In any case, your character will always be alive and well when you return, because the healing factor while you are sick is near instantaneous.