I agree with Tammy on all points. Get to a doctor for evaluation ASAP.
Feel better and keep us posted.
It could be a heart attack, pneuomnia, liver problems, heart failure or simple (although severe acid reflux).
Since the pain is in your chest and is getting worse, I would call your doctor and get seen today, if that is not possible than go to a walk-in clinic. It could just be acid reflux (since it can cause chest pain and lung symptoms that get worse when you lie down because of increased reflux) but since the other possibilities of chest pain can be very serious it would be worthwhile getting it looked at as soon as possible.
And even if it is only acid reflux, the doc can give you meds and a prescription that will make it feel better and stop it from occuring again.
Hope you feel better soon!!