Sounds like it, Meg. I have it more often than not. I have a little dog that likes to stand on my chest, when I'm laying down. She stares me in the face and gives me a little lick on the nose. Hurts like all get out but I love her so much I bare the pain. Anyway another thing that happens is, when I turn my head I get the pain in my opposing side of my chest.. so if I turn my head to the right the left side of my chest hurts. The pain is very similar to what you have discribed. I never heard of costo till I got onto this forum. I kept thinking I had a heart problem.. had all of the test.. not my heart. Turned out to be costo. I hate it!! But at least I know I'm not dying from a heart attack. One other thing.. I have anxiety attacks, I can almost gaurantee that I'll have a costo attack right about the same time. The pain is extremely exhausting and can take days to pass. Sorry for the bad news.
Hope that helps.
Happy Valentine's day!!
Yes, sometimes .. and as for the sighing thing.. I know I do it and I'm sure its really annoying to the ppl around me. But sometimes its the only way I can get a good deep breath. I know there's nothing wrong with my lungs, had them x-rayed last Oct. (yes, I'm stupid enough to smoke . so I wanted to make sure it wasn't something more serious.. so it's not the smoking).. I've had this problem for years...(about 20 years to be exact).
Hope that answered your question.