Byłem w szoku i trzęsły mi się nogi.

From Lesson 424:Dative of possession·Polish

Questions & Answers about Byłem w szoku i trzęsły mi się nogi.

Why does this sentence use mi instead of saying moje nogi (my legs)?
This is a perfect example of the dative of inalienable possession. In Polish, when an action happens to your own body parts (or sometimes close family members), you typically don't use possessive pronouns like moje. Instead, you use a dative pronoun to indicate who is affected by the action. Literally, the sentence says "legs were shaking to me." Saying trzęsły się moje nogi would sound unnatural to a native speaker, almost as if the legs were detached objects you happen to own.
What is the subject of the second half of the sentence, and why is the verb trzęsły?
The subject is nogi (legs). Since nogi is plural and belongs to the non-masculine-personal category (niemęskoosobowy), the past tense verb trząść się (to shake) must match it. That gives us the non-masculine-personal plural form trzęsły się.
Why are the words mi and się placed exactly where they are?
Both mi and się are short, unstressed pronouns (called clitics). In Polish, clitics naturally gravitate toward each other to form a cluster, and they prefer the second position in a clause. They also avoid being the very first or very last word of a sentence. Placing them right after the verb trzęsły is the most rhythmic and natural spot for them here.
Could I say byłem zszokowany instead of byłem w szoku?
Yes, byłem zszokowany translates directly to "I was shocked" and is perfectly correct. However, using the prepositional phrase w szoku (in shock) is an extremely common, everyday way to express being highly surprised or stunned in Polish. Notice that szoku is in the locative case, which is required after the preposition w when describing a state or location.

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