What is the prefix of please

A prefix refers to the group of letters that can be added in the beginning of a root word that may or may not change the meaning of the new word. Some of the examples of prefixes are un & dis that means not, mis that means wrong or wrongly, sub that means under, pre that means before in time and a lot more. Some examples of root words with prefixes are the following, undisclosed, dishonest, misspell, subway, prenuptial and others.

Agonized.  The author is saying that that learning to read for this character started to show him things that were difficult for him to know about.  He did not mean to literally wiggle or squirm.  He was visualizing what he read but it was more than that.  He was feeling the emotion as well.