At chinchilla shows most chinchillas will not eat/drink the normal amounts until they return home. Chinchillas do not like change ... as a general rule. Chinchillas do miss their human parents when they are gone. Chinchillas like a regular routine ... apparently, with you gone, the routine was changed. Chinchillas will often eat/drink less when there is a change in the routine and/or surroundings ... all three things happened within 24 hours for this little one. I can understand why Charz became unhappy/upset and did not eat.
Im really concerned, because Im going on vacation next moth, and I dont want to leave him if its the lonlyness thing D:
Where will Charz be and who will he be with while you are on vacation? Starting now, having this person become a bit of the regular routine could help Charz cope while you are on vacation.
How long will you be gone?
Making recordings of you talking to him and letting the chinsitter play it for him might be an idea to consider. Making sure the chinsitter knows how important it is to stick to a routine will also help Charz. If there are special times you normally watch t.v. or listen to the radio in the same room with him, you might think about setting the t.v. and/or radio on timers while you are gone.
Our chins love to listen to music and even have favorite t.v. shows. They're spoiled rotten!
Just some things to consider.
Jo Ann