Sternum pain

Hi i am 25 year old male. I dont know if this is the right area to post a question since i dont know if this has anything to do with any type of gastroenterology? But anyways i feel as if i have an ulcer. I seem to have all the symptoms, burning stomach which can last for hours or just go away, gets agravated by certain food but does help when taking acid reducing meds or milk. but ive also discovered that my sternum hurts to touch especailly when i sit down on the couch or like right now when i am siting for a long period of time at my computer.I found that it could be Costochondritis which makes sense because i seem to have the causes and symptoms especially lifting heavy things (ie my 1 and 5 year old daughter!!). I am wondering if this burning sensation has to do with inflamation (inflammation) from my sternum or is this totally something different like heart problems?? Any advice would greatly help. thanks!!