Coxsackie and mycarditis???? What is going on??

Hello, I am desperately searching for more info in regards to this virus. My boyfriend was recently admitted to the cardiac ward due to fluid around his heart. Our daughter had a fever just a couple weeks ago without any other symptoms and he took care of her as we kept her home from school. It sounds like Coxsackie from the research I have done. They are doing an electrocardiogram today to try and find out what is going on. He is only 26 years old. He had some sort of viral infection that caused the same type of symptoms when he was 17 which they treated and then released him. Only thing is this time around he also experienced pain in his arms when the chest pain was present. I'm not sure what the exact cause was the first time around. His family has a history of heart disease so needless to say I am very concerned. Any information any one can provide will be greatly appreciated. Thanks so much!