worriedI'm worried that he's not going to graduate.
concernedAren't you concerned that she might tell someone?
perturbedformalHe didn't seem unduly perturbed by the news.
fretfulShe got a fretful night's sleep after the dreadful news.
anxiousAll this waiting is making me anxious.
apprehensiveHe's a bit apprehensive about leaving home.
franticWhere on earth have you been? I've been frantic.
have something on your mindI've got a lot on my mind at the moment.
lose sleep overIt'll be OK. Don't lose any more sleep over it.