C. Anne, I hate to tell you this because I know it will scare the bejeezus outta you, but I am presently recovering from suspected H1N1 and my first symptoms were pain in my chest area.
Now, I don't know that that is going on with you, and in fact, it might be unlikely. But I'm telling you so you can make sure to get checked out by a doctor and make sure someone can come take care of you if that's the case.
For me, day 1: chest pain around the sternum and sometimes more on the right side -- a constant dull ache
day 2: chest pain still there, joined with back pain. very slight "gravely" feeling in throat (didn't seem like illness, just like my voice was a bit strained or something)
day 3: coughing starts, aching all over, low-grade fever
I'm now on day 6 and starting to recover, no more fever, feeling "sorta" perky. Still coughing, but mostly better.
The chest pain for me (which I assumed was just a strained muscle or anxiety or something -- did not feel like flu) I think was either the mucus settling into my chest or the aches and pains of flu. GF had it (worse than me) and did not get most of the pain related stuff, but she did have some achiness and burning (felt like heartburn to her) in her chest area the first day.
Please don't panic -- it's probably not h1n1, and even if it is, you should be FINE, but do go to the doctor and get checked out.