Salary (or earned) income is the one part of this that you don't need to worry about. Furthermore, unless you've been doing something unusual, you will probably owe the US little if anything in taxes.
If you feel like stressing, FBAR, FATCA, insane forms, draconian penalties for minor errors, denial of banking services/business opportunities and high tax preparation fees are more worthy targets of angst. All these are more of a problem than the actual taxes. I would pay an annual membership fee to the US just to be rid of these.