I just joined this website. I got flattened 10 days after receiving a flu shot on November 10th 2011 and have subsequently been diagnosed with ME/CFS. Dr. Byron Hyde here in Canada is convinced it was the flu shot that did this to me. In his practice he sees many people made ill by this vaccine. He said the Hep B vaccine though is by far the most dangerous one for adults. His most severe and disabling cases of ME are from the Hep B vaccine. Luckily he says people can actually and do recover from flu shot induced ME. I hope he's right!