Someone help me out

So, for about 2 weeks now, I've been having a hard time breathing, my chest has felt tight, like something heavy is lying on it, it's starting to having a burning sensation when I try and take deep breaths. I'm not pregnant, I've never been diagnosed with any diseases. I plan on going to the doctor Friday after work, but it's currently 9:30 PM and I cannot sleep, I have work at 6AM. I'm tired but this not breathing thing has me scared. It feels like a panic attack but I'm not panicing.. I also don't feel stressed either. Anyone have any ideas?

Edit: 9:47 PM my heart rate is at 61 bpm