Any nausea, sweating, breathing difficulty, is it worse when
you lie down, is it made worse
with deep breathing
or exercise (ie walking).
It is likely simple heart burn, but depending on your history, symptoms and clinical presentation, your doctor may want to follow up with more tests. I would just make an appoinment with your doctor so you won't worry about this. Let him be the one to make to make the call as to what is really going on.