Hi, You have probably pulled a muscle but just to make sure i would check with a doctor. If it gets worse i would go to your local hospital. Never feel silly about asking for help with your health at the doctors. Good luck hope you are already feeling better. Take care
Sounds like a gall bladder attack...especially if it is radiating into your back on the right side , eat low or no fat meals , don't eat after about 5pm ..there are foods that will trigger an attack that you should avoid, if you go to yahoo you can get a list of them .If its very painful a visit to the doctor as it could be gall stones ..good luck