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.
at your wits' endI've been at my wits' end wondering where you've been.
have something on your mindI've got a lot on my mind at the moment.