breathing problems / congestion

Hey I was wondering if anyone with panic disorder has trouble breathing like I do and if you know any techniques to fix it. It's not a very serious symptom - to me it just feels like I have a cold or something, and I'm all congested or maybe something is inflamed or I don't know. It's not anxiety-related insomuch as I don't worry when it's happening, nor does it happen when I'm subconsciously anxious (for all I know), but it's very annoying! I also know that it is not something like asthma, because it will go away if I get angry or if I'm in some kinds of social situations. But I have not hacked my emotions enough yet to master clearing my sinuses.

So, does anyone else have this problem, and are there any techniques you use to get rid of it?