2 things-
reflux can definitely cause this with NO heartburn symptoms. THis once happened to me and I thought I was having a heart attack and it turns out it was the reflux.
I have known people to have no symptoms of pneumonia but still have it. Go to a med express place this morning. They have been my go-to place for stuff like this b/c you don't hav to wait for an appt and the wait time is much less than my docs. Get there first thing and they will take you right in. Yo just don't want this to get worse and be in the ER on Christmas.