What's the word for...?

Find that expression on the tip of your tongue

phantom vibration syndrome

The perception that one's phone is vibrating or ringing when it is not; often experienced when someone is anxious about missing calls or messages.

Examples:

I keep feeling my phone buzzing in my pocket, but there's nothing there; I must be experiencing phantom vibration syndrome.
She dropped her phone and for a moment thought it was gone, a classic case of phantom vibration syndrome.

cognitive dissonance

The mental discomfort experienced by a person who holds two or more contradictory beliefs, values, or ideas, often arising from their thoughts and feelings about a situation.

Examples:

Upon realizing her phone was in her hand, she felt cognitive dissonance about her earlier panic.
His cognitive dissonance grew as he checked his empty pockets only to feel the phone he had in his hand.

anxiety spiral

A state of heightened anxiety that is triggered by a misunderstanding or misperception, often leading to escalating worry and panic.

Examples:

When I thought I lost my phone, I entered an anxiety spiral that made everything feel overwhelming.
He went into an anxiety spiral over his misplaced keys, only to find them under the couch, just as he did with his phone.