I agree with Irene. If you've been having bad chest pains all day, you really should have it checked out. Even it ends up being nothing, you'll feel so much better when you're told that by a physician.
There are many things that could cause the pain: lung problem, gas, gall bladder, muscle pain and possibly heart. If you're feeling that terrible you should really be seen by a doctor. Please don't let it go on when there's help available.