On the left side-your heart, left lung and pancreas (behind stomach on left).
Because you should want to rule out a serious heart problem with your difficulty in breathing and chest tightness, etc., I recommend you have someone take you to an ER and do blood testing to be sure you are not having a heart attack. I'm concerned about the face swelling as well. Please have someone take you in right away!
Please seek emergent care asap!
my suggestion would be to see your doc and have him listen and/or x ray your chest. although it doesnt seem like its cold or congestion related it could be pleurisy. good luck.
Welcome to the MedHelp forum!
If the pain is under the shoulder blade then it could be due to a problem with the stomach (like acidity, gastric reflux, hiatal hernia) or due to pancreatitis, ectopic pregnancy (ruled out in your case as you are a male) or in the chest like angina or heart attack, pericarditis, pleuritis, pneumonia, pulmonary embolus, aortic dissection.
Since you have heaviness in chest, it could be any of the above conditions. It is difficult to diagnose on net. Please do not ignore and consult a doctor ASAP.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!