Seriously though, the buzzy feeling has gone. I have had a low grade fever on and off. My left arm is really sore at the shoulder where I was injected. Feel kinda tired. Napped a little. From people I know, its about 12 hours later that it can lay you low for a little while. I am updating so people can know my experience. But, it is only mine and apparently there are a lot of different ways this can manifest.