Since you haven't been measuring your numbers up until now it's possible your PH has been low for a fairly long time. It's true that a high acid level can damage your pool especially if you have metal components such as as a heater inline or low quality stainless steel ladder etc. but for practical reasons I wouldn't sweat it that much. If you can get the PH up a bit before you leave then all the better otherwise just go and have a great vacation and deal with it when you get back.