Increased sodium intake can affect your BP by the next DAY if you're salt sensitive.
Were you getting the higher readings ON vacation or upon your return? If the latter, it may not only be the extra salt you were ingesting, but the mere fact that vacation is over (sob

) and the realization that your back to the old grindstone!
Go back to being a good boy regarding the sodium

and see what the next few days look like.
zuzu xx