I got the flu shot 3-1/2 weeks ago. Saw a doctor because the pain was so bad I couldn't sleep. He said I had gotten the shot in my shoulder joint. This is serious, folks!! It's like you've gotten a chemical poisoning into your shoulder. If you think this has happened to you, get to a doctor ASAP, and get a cortisone shot. That should help, and immediately take care of the pain. If your doctor poo-poo's you, get to someone else!