sick with worry

don't worry

Synonym of none of your business.

out sick

Absent from work due to an illness.

sick and tired

Bored to the point of weariness.

sick as a parrot

Very disappointed; miserable.

sick at heart

Despairing, distressed, or anxious.

sick list

A list of people who are ill.

sick man

A weak member of a peer group, especially the weakest.

sick puppy

A person who is sick (mentally disturbed) in a morbid or gruesome way.