Been there and done that a couple of times. I cry and worry all the time I am gone! Once was for 7 days and the last was for 4 like yours. Other than being a bit angry at me when I came home - all mine did just fine. And their stand-offness only lasted a day. I did make a couple of special toys that the person taking care of them could put in the cage every couple of days. As long as they have someone to talk to them and take care of them a couple of times a day they will be just fine! Oh, by the way, the first time I left I had to hire a stranger to take care of them because the whole family went together - that REALLY bothered me.