 [ Symptoms ] what would cause a 61 yr old male to all of a sudden be terrified to be alone  is for some reason terrified to be alone he often outa the blue starts crying when asked y he says he do not know he does not have any physical pain he do not have any viral or bacterial sickness or symptoms he does have bad anxiety loss of appitite and sleeps almost constantly he has become really needy im guessing anxiety and depression but why or how just like that causing such dramatic change in behavior in a matter of a few days [ Disease ] i would suggest getting him evaluated by his physician sooner rather than later there are several different things that can cause this type of sudden behavior change but diagnosis will probably require a test or two good luck