Diagnosing Abdominal Pain...Intestinal Infection or Muscular

I have been experiencing pain in the right area of my rib cage towards the center. About 2 months ago, I went to see the doctor when it was not as bad. I was given an ultrasound but the doctor couldn't find anything wrong. But by listening to my abdominal area with a stethescope, he said that it sounded 'hyper' and was probably an intestinal infection. I was given 2 days of antibiotics and left it at that.

Recently, this pain has been getting worse. If I press that area of my ribs, it feels like they're badly bruised or something. Stretching or excessive movement seems to aggravate the pain or bring it on. Possibly the pain is coming from below my ribs but i'm not sure. Breathing isn't a problem and my stomach is fine. I also don't drink alcohol or smoke or play sports so I don't have any injuries. I don't think it would be due to my lactose intolerance either because I always take Extra Strength Lactaid before eating any dairy products. The only thing I can think of is that I use the computer about 2-3 hours a day (more on weekends) on the bed, kind of hunched over it. I sometimes tend to lean more onto my right side because i'm right handed with the mouse. Could this be related? But if so, why has it worsened even though I haven't used the computer in the past week?

I'd appreciate any help or advice that anyone can give me. I've had to leave the country that I have medical insurance in due to a family emergency... So i'm in a country with no medical insurance for another 2.5 weeks. I'm really concerned about this problem because i'm constantly aware of it and will be on a plane for about 18 hours on my return trip.