There is a lot going on here, and the symptoms do sound fairly severe and persistent. Therefore, I think you need a repeat evaluation, which could be by your primary care doctor
if you can be seen urgently or a repeat trip to the emergency room.
The history of a collapsed right lung is concerning to me. In the absence of additional information to explain why you had a collapse lung (such as a traumatic accident), it makes me think of something called spontaneous pneumothorax
, where the surface of the lung bursts allowing air to escape and compress the lung. If this was the prior cause of your collapsed lung, then you are at risk of this happening again as well, and this should be ruled out.
There are other causes of chest pain and shortness of breath as well, which could include asthma
, a heart attack or problem with the heart rhythm (this would be unlikely in the absence of a history in someone your age), or a blood clot in the lungs, among numerous others as well. I think getting in touch with your doctor and explaining to them that the symptoms are persistent and quite severe is the best first step.