Be worried sick; be sick with worry American British adjective
to be extremely worried
Jasmine: Are you OK? You look not really well. Ana: I'm worried sick about my future, I don't know what I'm good at and what to do.
Hayden: Where were you at? I've tried to call you hundred times but you didn't pick up the phone. Jack: Sorry, my phone's battery was dead. Hayden: I thought something bad happened, I'm worried sick about you.
Waiting for the test result makes me sick with worry.
The phrase starts with 'to be', therefore, it need 'subject verb agreement'. Besides, we should use it in the approriate context.
If you swallow the bait, you take something that someone offers you, or agree to do something that someone asks you to do without knowing that it is a trick or way of getting something from you.
You can't just do whatever he wants you to do. Don't swallow the bait.