I am feeling really sick these days. I have this problem of unable to breathe in like fully. I did some research, and this is what i found.

http://panicdisorder.about.com/b/2007/02/17/i-feel-like-i-cant-breathe.htm

If what this article says is true, then I might be having a Panic Attack. Which causes breathing difficulties.  
I pray for my health and yours.