Are “zingers” possible 2 years post op?

Thanks for your question. In light of the fact that you have had multiple prior surgeries, there is a real possibility that there are some nerve fibers trapped in scar that are periodically acting up and sending you reminders that not everything is "normal" in your breasts. Remember that a woman's breasts are dynamic and subject to hormonal influences. Therefore, if there is some periodic swelling, that can definitely "wake up" some nerves that may otherwise be quiet. If you have ongoing concerns, it would be best to follow up with your more recent plastic surgeon with whom you apparently have confidence. Best of luck to you and I hope your zingers eventually indeed resolve. 

It sounds like you may have over exerted yourself which can be possible.   I would suggest that you have your plastic surgeon perform and examination and review your history to make sure everything is ok.   Zingers usually go away in a couple of weeks but if it does not then you should see medical advice.