The phrase "a frantic state of" is correct and usable in written English.
It can be used to describe a condition of extreme anxiety or agitation.
Example: "After receiving the unexpected news, she found herself in a frantic state of worry about the future."
Alternatives: "a state of panic" or "a chaotic condition".
A few weeks after we had moved, Susan called me at work in a frantic state: A deer had bolted in front of the car in broad daylight, and the collision was intense.
She spent the next seven months in a frantic state as she endeavoured to complete the narrative, fact-check each of the historical details referenced in the novel, and decide on a title.
Soon after Christina Mateo received notice of her ineligibility for shelter, she called me in a frantic state.
First, don't call the person in a frantic state.
But, at the end of the piece, Brooks left us with the image of the dancers in a more frantic state than we'd seen up to that point — hemmed in and not knowing, or remembering, how to break free.
The bird in distress, the most attractive and volatile, draws all the attention, its frantic state amplifying the unnatural calm of the vendor, who seems not controlling but protective, as if uncomfortable with the intent to sell his charges.
It didn't taste too bad but you were reduced to a state of frantic imbecility by less than a mug full.
From atop his slightly terrifiying spaceship stage, Sonny unleashed countless tracks from his debut album Recess, a handful of bass bombs from throughout his career, as well as a laundry list of surprises like the The Lion King theme song, which quickly segued into an animalistic moombahton remix that had the crowd of 10,000-plus united in a state of frantic hysteria.
Given the mortifying state of Healthcare.gov, it would be easy enough to ascribe to him a frantic, desperate, Willy Loman state of mind.
