2 Days Ago When I Came Home From Work, I

2 days ago when I came home from work, I felt like I had an air bubble under my right side rib cage. I have had " air bubbles " before & if I take a deep breath, I can feel it "pop". This time was/ is different. I cannot catch my breath, my rib, stomach, and back feel like one constant spasm. I have a cough and have to hold my right breast up in order to pressure on my rib cage to try and "soften" the blow.
My Question is.....could this be a sign of MS? Or is it just a pulled muscle?