Help needed after guinea pig had to move!?

Guinea pigs often like to be with other pigs, even if they have been raised alone for most of their lives. Unfortunately since he is not neutered putting him with another male may cause problems. I would consider getting him neutered and getting a female for him, or getting a spayed female or perhaps even a young male who will learn his place easily. Is it possible that he is too cold or too hot? Also, is he getting enough vitamin C? Guinea pigs cannot make their own vitamin C and lack of it is a common health problem in guinea pigs. If his food contains it then he should be fine, if not you may want to supplement him with citrus fruits or water soluable vitamins made specifically for guinea pigs. Also, he may just need some more time to get used to things, it has only been two days and he probably hasn't been outside that often. He also has a good sense of smell and even though there may not be predators closeby he might be able to smell things that make him nervous. Good luck with your guinea pig!