I've been having trouble breathing for more than two months now, especially when I laugh or talk, and it feels like I'm out of breath easily. I went through an X-ray and a cardiac check, and both seem to be normal, but I'm still not sure what's causing it. Can you help me figure out what might be going on?

It sounds like you may be experiencing a form of anxiety or stress-related breathing difficulty, especially since both your X-ray and cardiac check are normal. It could also be related to muscle tension in the chest or diaphragm. I recommend consulting a respiratory specialist or considering breathing exercises to help manage this.