He told himself he could do this. He felt a shiver of excitement, then a buzzy sensation. If he made it through the night without sleeping, he'd be a different person, somehow. A more important person.
The above paragraph comes from the book The Year of Billy Miller on page 134. As for the second sentence—he felt a shiver of excitement, then a buzzy sensation—what is the meaning of a buzzy sensation? Is it a feeling of excitement?
What is the difference between felt a shiver of excitement and a buzzy sensation?