I am 34, I am overweight too, a few days back, I was having chest pains in the center of my chest, antacids helped, it felt more like an undissolved pill in my chest than anything. That pain has now gone. But has been replaced by this weird jittery feeling inside that you would normally get by drinking coffee and not eating, although I am eating. My stomach is also kind of week feeling. I am not really dizzy although my head does feel weird. And to top that off, it's hard to stay warm, then I get a hot flash every now and again. What could this be?