I have this popping feeling in my upper abdomen. once it "pops" my legs go hot, and my heart races. hand tremors follow and i get very cold. ?

I can't think of any: ...anatomic connection between these symptoms. Most likely they're connected via your nervous system (brain, spinal cord, nerves.) and/or cardiovascular system (heart, blood vessels) Possibly, you could have a hormonal (example, thyroid) problem. My intuition suggests it's a "panic attack," but you must see a doctor to know for sure. Best wishes. Dr. Anne