I have been on medication for GERD for about 5 years now and it is usually manageable as long as i take the daily dose. For about 5-6 days now i have had moderate chest pain beginnning generally mid-afternoon. Initially, i thought i just needed an extra pill which occasionally happens. But this is continuing each day and i'm beginning to wonder if i might have something like hiatal hernia. The discomfort lasts until about 10 -11 p.m. and is gone when i wake up in the morning, but begins to build up later in the day. I also have difficulty swallowing and some shortness of breath when it is at it's worst. I don't think this is heart related chest pain. What might it be?