Hey, My friend got sick last night, out of no where, he is experiencing puking up water, his joints and knees aching, diarrhea, feeling cold and shivering, and sweating. I have looked online and seen that it might be a 24hr bug or a virus or the flu, but I'm not sure what it is, can you please tell me? Also, if you can identify what it is, can you tell me how it can get better?