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.
The inexplicable or concealed place or state indicates the afterlife.
I'm very sorry for your dad. He's beyond the veil.