Sounds to me like there should be a whole lot of more testing. One case is not going to be conclusive in anyone's book, but it is at the very least a reason to be skeptical and test a lot of other things. Do we know what a regular flu shot does to your immune system? Do we know what any number of vaccines does to our immune systems in the short run and the long run?
I know what happened to me after the second shot and it was a close call, but I survived it so far.