I had the same experience as you. The worst case of flu I ever had was brought on by a flu shot.
I have never taken a flu shot since—and have never had the flu again.
Kewl.
Complications of flu
Complications of flu can include bacterial pneumonia, ear infections, sinus infections, dehydration, and worsening of chronic medical conditions, such as congestive heart failure, asthma, or diabetes.
http://www.cdc.gov/flu/keyfacts.htm
You can’t get the flu from the flu shot, though you can expose yourself to the flu by going to the doctor’s office or hospital to get the shot.