Jenn,
I find you being so out of breath you can't get a sentence out worrisome. This being brand new raises concern too. Pain and fatigue are things we are all familiar with and we probably all know our limits fairly well.
What you are experiencing sounds like it has the possibility of being something else. If you don't get better, feel worse or have concerns it is something serious please get checked out. This might mean going to the ER if you deem it necessary. Just take care of you okay?