Upper left abdominal pain. This please?

I've been experiencing low to mild upper center to upper left abdominal pains for about a year now. It comes and goes what appears to be random. It's tolerable but discomforting. At times it's accompanied by sweating, tingling on my hands and head with what feels like I'm having trouble breathing even though I can still take full breaths. I went to the ER several times and after chest X rays(always assumed it was in my chest) and blood tests I was always told there was nothing wrong with me. The doctors say it eas anxiety and panic attack but I'm not so sure that is the case since every time it happends its always random even if I'm calm. The minor aches are tolerable it's just that random sweating, chills and what feels like I can breathe that worries me. I used to think it's related to my chest now I think its my abdomen. Can someone shed some light on this please? Thanks.