I don't think this is related to an anxiety disorder, though no doubt it is causing you some anxiety. Your family physician should be able to determine the cause and be able to suggest a remedy.
I can't answer your question, Amiya. This is a forum for anxiety disorders and while your symptoms may result from stress, there are many possible physical causes too which need to be checked and ruled out.
Were the antibiot
Was it after you were driving...etc.
This might help you and your doctor figure out what is causing it. The upper rightchest... always a good idea to get chest pain evaluated by a doctor.
If you are a healthy, young active person...
pain in the right upper quadrant (under the ribs), even stuff that isn't typically associated w/pain in that area. For instance, appendicitis typically starts around the belly button and then moves to the right...