Should two independent clauses separated by "and" also have a comma even when used in parantheses with the phrase "you know"?

My question deals specifically with this example:

I was extremely excited, so it was hard for me even to grab the doorknob and turn it—I kept on missing and my hand was shaking, you see—but once I finally got that done, I flung the door open and scurried outside.

Should there be a comma after missing so that it looks like the following?

I was extremely excited, so it was hard for me even to grab the doorknob and turn it—I kept on missing, and my hand was shaking, you see—but once I finally got that done, I flung the door open and scurried outside.

Thanks!

Solution 1:

A comma can serve a grammatical purpose in that the same words with a comma can have a different meaning to those words without a comma. In this example, a comma would not have any grammatical meaning, it would only signify a pause if those words were read aloud. How would you say those words? If you would pause after 'missing' then put in the comma, if not, then not.