I went on a week long trip with half of my family to New York. I had my sister who stayed home look after my two guinea pigs. When I came home and checked on my guinea pigs I noticed that they weren't sqeaking or saying anything like they usually do when I come into the room. Still, I gave them water and food like usual but the still stayed in their houses. Finally, when I gave one of them (Blondie) a treat he came out. Both of them weren't really eating the food I gave out. I picked up Blondie for lap time and noticed he was shaking! I put him down on the floor but he wouldn't move around. I have never seen any of my guinea pigs shake like that. Please help.