OMG---I thought I was reading about myself! I have been experiencing very similar situation/pains/symptoms since May!
I was working out 4-5x/week (cardio--spinning, eplitical, treadmill; weight training--machines like rowing, upper body---light weights, but still some resistance)---when I started getting pains in my sternum and upper right quadrant (under my right ribs, around to my back---up to my shoulders, neck, and the xyphoid process--that little doo-hicky that is where your sternum splits was sticking out!)! It also hurt to eat--and felt like food was getting stuck where your sternum splits---along with the pain on the right side after I ate.....
I couldn't walk to my mail box without feeling like someone punched me in the gut---and I lost my breath! It was torture!
I had the following tests done: spine xray, Stress EKG, B12 deficiency (b/c my right arm and jaw were numb), Abdominal Ultrasound (gallbladder), Gall Bladder hida-scan, MRI, celiac disease bloodwork, liver/kidneys/white-red blood work, MRI of thoracic region. I also had a rheumatoid/arthritis antibody test done! I have gone to my Primary, a Physical therapist, a Back Specialist and a Chiropractor. Next week (after waiting for 8 WEEKS TO GET IN AND SEE THIS DUDE)---I am going to a GI specialist! (I went to a GI specialist 2 years ago for GERD--he I had some spots outside my espohogus---had an endoscopic ultrasound done--they were just 'fibroid-like cysts----fluid. Go home and get over it')-----GI Specialist #1 refused to see me (NO REASON GIVEN- I think it's b/c I cried in his office and he had really bad bed-side manner)--so, I had to find someone who would see me! That in itself, was a trip----DOCs are afraid to see you if you have seen someone else for a similar problem! OOY!
ALL TESTS HAVE COME BACK NEGATIVE!
I have been on: Prilosec, Acidphex, Protonix, Lexapro, Valium, Celexa and Klonopin (last four are for anxiety and depression/panic--huh?)
When I went to the PT---she did say that my rib cage, on my right side, was higher than my left---and she could feel inflammation (Costochondritis). I also had some "bulging" on mid-back discs T4-T6, and thought maybe I was having 'referred pain" to the front/abdomin. T4-T6 were misaligned---and I got those back into shape--but, I still have stiffness--and pain in my back/chest/rib cage on the right side--sometimes left side!
BUT----as time went on--and I felt more anxious about the situation (no--the Lexapro, Valium, Celexa---didn't work----I had an adverse affect. Klonopin works--but, puts me in a Zombie state of mind).
6 Months later---and all of the crap mentioned above---I still have pain, and no answers! You (in general) really start to think you are going crazy with everything going on!
I still have aching/pain in my mid back, right side ribs, and between my sternum (where it splits). I still have a hard time eating much----and am tired of eating yogurt w/ granola, chicken/cheese sandwhich (with nothing on it), bland food, salad (with no dressing), and chicken soup!
SO---my point is (sorry, I do get long winded)-----I can TOTALLY sympathize with how you are feeling! I have been posting for a few months about these exact type of symptoms---and no one has been able to answer me (not even the MDs)----
I hope that you can find some answers----and know, that if this situation is giving you health anxiety/panic---that it is OK to talk w/ your Physician about it---and see if taking something to help you 'relax' about it will help you get through it until you can get some answers!
I am hoping to get some answers in the next month or so----but, this waiting around for appointments drives me freakin' insane (figuratively speaking---LOL)!
If you still feel bad---continue to post here---even just getting a cyber hug helps a little! I feel your pain--and know exactly how you feel! How strange that someone is experiencing the same things as me!
Let us know what happens, so I can talk w/ my MD about it too!