With regards to the meat it is more than likely a bacteria could have got into your body rather than a virus. With regards to viruses, there is of course the possibility of autoimmune response. A virus certainly doesn't want to kill its host, it needs a host to copy itself using their DNA. In some cases, the virus seems to trigger the body to attack certain types of its own tissue, such as smooth muscle. This can be detected by using blood samples. The speed in which your health declined does seem to relate to some kind of infection which has recently occurred. The usual treatment for autoimmune response is steroids.
Have you been told that you have cardiomyopathy or myocarditis? If you have, yes, viruses can and do cause serious heart problems. The great--actually enormous--difficulty is why these problems occur with some people and not with others who have been exposed to the same virus.
This is a subject that is not at all understood but the likelihood that defrosted or rancid meat caused your illness is beyond tiny.
If you have been given at least a tentative diagnosis, PIN YOUR DOCTOR DOWN. He/she may not have the perfect answer, but there will be a best-guess scenario.
On the bright side, you are fairly young and have been healthily active. Your body is going to do everything in its power to get you back to normal, and with good medical care, you may very well get your life back.
not sure hope you get a answer but i am praying for you now