I hate to recommend this, but take it to a Nissan dealer. Many independent shops do not pay for the subscriptions (or in some cases they are not available) to look up all the diagnostic codes. If you want to spend the money, you can get the code yourself. There are cables and software where you can read them with a laptop and there are bluetooth adapters and software for smartphones/tablets where you can read them. If you do that and post on this site, you may be able to get someone to tell you exactly what it means.
The symptoms you describe could plausibly be caused by a bad O2 or MAF sensor. A cheap thing to try would be cleaning the MAF.
Good luck. That must be frustrating as all get out.
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