Hello I’m A 43 Year Old Male I Have A

Question : Hello I’m a 43 year old male I have a situation when I sometimes bend over my heart begins to beat very fast with a burning type feeling in my chest breathing is fine episodes last 5 to 10 mins sometimes happens about 7-10 time’s a year. Then It stops as fast as it starts Had every cardiac test under the sun all clear endoscopy clear. Colonoscopy clear. Abdominal ultrasound also clear. I’m 5.10 rather slim 190 pounds but have belly fat just in stomach area other than that rather slim these episodes have been going on for 7 plus years with no dr being able to diagnose I’ve been on anxiety meds No help They come on sudden with no strenuous activity simply bending over like something is getting agitated I can go weeks with no symptoms then bam it happens . Drs keep telling me it’s nothing but I’m getting frustrated any help would be great. Mark

How is this diagnosed as it’s never happening long enough in order for me to get to emergency room. And what would the treatment be if any