Well i'm a bit too happy sometimes that it annoys my parents haha, it's like having ADD. I discovered last night, when i breath through my nose my heart rate goes very low, in the 40's and when i breath through my mouth it goes back up to the 60's. Have a feeling that i don't get enough oxygen or my heart doesn't during walks with my mouth closed that that makes my heart race and give me a cold feeling? I'm no expert but it's just a thought and in some way it makes sense to me. I always used to breath through my mouth and never had issues my whole life. But i recently started breathing through my nose, cause i heard it's healthier, and now i do it automatically.