Truly

This word marks that there is more to the truth than what has just been said. AT: "Moreover"

to suffer affliction

"to be mistreated by others"

Paul was describing his own emotions by using an idiom. AT: "I could not longer wait patiently" (See: rc://en/ta/man/translate/figs-idiom)

It is implied that Paul sent Timothy. This can be made explicit. AT: "I sent Timothy" (See: rc://en/ta/man/translate/figs-explicit)

"our hard work among you" or "our teaching among you"

"useless"