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Thank you for getting back to me. When a guinea pig stops eating, it is a medical emergency. The fact that he has 't moved for so long means he is in critical condition. Do you have a vet? Here is a directory of guinea pig vets:
As a first aid measure, you can smear some honey or pancake syrup in his mouth. He may be hypoglycemic, and if he is, that can help.
Other than that, this is too serious for you to do anything to help at home. I hope you can quickly find a vet.
I will opt out of your question in case someone else has other ideas for you. I hope your guinea pig will be able to recover.