I, and I/me alone, did it all
I, and I/me alone, did it all.
Which option, I or me, and why, should be used in a parenthetical like this one?
Secondly, is it the same situation as in Me/I alone, I did it ?
Solution 1:
You use "I" because it's part of the subject; putting it in a parenthetical with a qualifier doesn't change the pronoun that's used.
"Me" is used in an object, so you could say
He gave it to me, and me alone.