n. 25B6; verb
she worries about his health : FRET, be concerned, be anxious, agonize, brood, panic, lose sleep, get worked up; informal get stressed, get in a flap, get in a state, stew, torment oneself.
is something worrying you? : TROUBLE, bother, make anxious, disturb, distress, upset, concern, disquiet, fret, agitate, unsettle, perturb, scare, fluster, stress, tax, torment, plague, bedevil; prey on one's mind, weigh down, gnaw at; informal rattle, bug, get to.
a dog worried his sheep : ATTACK, savage, maul, mutilate, mangle, go for; molest, torment, persecute.
25B6; noun
I'm beside myself with worry : ANXIETY, perturbation, distress, concern, uneasiness, unease, disquiet, fretfulness, restlessness, nervousness, nerves, agitation, edginess, tension, stress; apprehension, fear, dread, trepidation, misgiving, angst; informal butterflies (in the stomach), the willies, the heebie-jeebies.
the rats are a worry : PROBLEM, cause for concern; nuisance, pest, plague, trial, trouble, vexation, bane, bugbear; informal pain (in the neck), headache, hassle, stress.