I reacted exactly the same way to the booster as the vaccines, because it's actually the same vaccine again I believe. But while that's logical, our brains don't work that way, so there's no shame in feeling some anxiety.
It does sound like your anxiety may have made it worse for you but it doesn't sound like it was dangerous, just unpleasant? Is there anything you can do to keep your mind occupied? I find I'm at my worst when I have nothing to do ,then my mind races with worse case scenarios, so if I don't have work to do, I'll play music or read a book.
