Thanks for posting. I’m in a similar situation. I’m 55, in good health with stress levels no different than it’s been for the last 10 years. In December I caught a cold, used nasal spray and I’ve had this issue now for 3 months. It started in the middle of the night I thought from the nasal spray. I stopped taking it immediately. I’m recovered from my cold, chest x Ray, stress test and pulmonary exam all normal. Doctor says it’s anxiety. There has to be an underlying cause. I breath fine until I start paying attention to my breathing. It seems like I can’t take a deep breath. Full exhale helps me get back to normal breathing. There has to be a reason this is happening.