This is an idiom meaning "Be quiet" or "Stop talking" (See: [[rc://en/ta/man/translate/figs-idiom]])
# let me alone
This is an idiom that means "stop bothering me" or "stop hindering me" (See: [[rc://en/ta/man/translate/figs-idiom]])
# let come what may on me
Things coming on a person represents things happening to a person. This expression starting with "let" means that he does not care what might happen to him. AT: "let whatever may happen to me happen" or "I do not care what may happen to me" (See: [[rc://en/ta/man/translate/figs-metaphor]])