Shortness of breath. Food insensitivity?

I have been facing shortness of breath and rapid heartbeat on and off since 3 years now. I mostly get it after eating my meals or while eating my meals. My chest gets heavy, i find it hard to catch on my breath, sometimes i feel heaviness in my head too. I am tired of speaking to doctors and they all call it anxiety. But i know its not. My heart rate ranges from 90-110- goes upto 132 even if I'm doing normal day to day errands. Please suggest me tests that i can take. Could it be food insensitivity? I dont even know what kinda doctor/specialist i should see, who is a fit choice and can address these issues. Every doctor just laugh it off. At this point i honestly cant take it anymore. Please pleaseeeee help me out.