Two years ago I began to get severe stabbing pain on right side chest under breast straight through to my shoulder blade. It came on suddenly and was excruciating with every movement or breath. It lasted for about an hour and left as quickly as it started. After the pain faded I felt like I was breathing through a straw. That was about 2 years go and it has been off and on every few weeks since.. A complete nightmare.. 3 emergency room visits 2 pulmonary specialists. And 4 urgent care visits and every X-ray and blood test was fine..so I just live with pain because I can't aff to be turned away with no answers again. So 5 days ago I go to er can't breathe and pulse was 170. They waited for my pulse to go down and let me go without doing a thing.. Next day I went to my primary doc and they did cat scan.. And they come back and say that my right lung had collapsed. I felt completely scared but so relived that they see what I have been complaining about for 2 years but they say it can't go on for 2 years.. So what is this pain I have been feeling 2 years then? They say it's spontaneous. Any ideas why I wo have this pain? It comes every month like clockwork. Sometimes a day sometimes a few weeks. I'm non smoker 5'3 and 115.