I never had an attack, but from what I know from friends, they had a fever and vomited. I also heard that if you lay on your back and can't bend your knees, it may be appendicitis. If the pain worsens, I'd call the doc right away. Don't take apsirin or a pain killer to mask the pain either. Hope you feel better. I hate those aches and pains you can't decipher.