unwanted "friends"

damn freaking sick lor...i'm down again with blocked nose, itchy throat and coughing...kns...this 3 good friends have been with me since last year early november....then they on off on off come visit me...let me relax a few days nia zzzzzzzzzzz....now im feeling so terrible...cannot breathe properly....keep coughing....wtf!!! when can i stop being friends with them? they really drives me crazy -_-"