I dread going anywhere for more than a day because of my fear of something like this. Couple of years ago, I had 2 discus died on me because our then housemate, did not know what a thermometer and a heater looked like. The heater I had then went bad while we were away, it shot the tank up to 105. Our housemate called me up and told me that they died and he didn't know why except that the tank showed condensation under the glass top. I asked him to tell me what the thermometer reading was and his replied was at 80. It turned out the dang fool gave me the temp setting on the heater.
Not sure about you, but it's hard for me to ask someone on this group to watch my tank for one simple reason, most if not all of us have families and other obligations to tend to. Even if you folks are only a few minute drive away, that is still a few minute too far and too long for me to ask for help and feel comfortable doing it.