I'm not a doctor but what you are describing sounds like a normal sinus rythym. I can't remember what it is called but some people have that when they breathe in and out. When you breathe in your heart rate speeds up and when you breathe out it slows down.
Has your chest ever felt heavy and tired before yesterday? If not, they that is probably anxiety over what happenned.
Frenchie
I wouldn't worry about it too much, however, I think I would get it checked by a doctor. It may just be muscle strain, but, when it involves any kind of pain in the chest area, I always say it is better to be safe than sorry.
As to the beats, those sound like they could be PVC's and they are pretty common, you will find lots of info on them through the folks in this forum, we are all PVC'ers'. In a structurally normal heart, they usually are benign.
Hope this helps, and if you are interested in learning more about PVC's read others posts and also do a google on them, there is a wealth of info there.
Susie