Fainting spells

Nicole
Hi ladies! I'm having a health related issue that no doctor can seem to figure out. Since I was 15 (I'm almost 29 now), I've fainted about 10 times. These times I've completely passed out and lost consciousness. I cannot tell you how many times I've come close to fainting. It happens a few times a week. I'm a cardiac registered nurse and I know this is not normal. I've seen multiple cardiologists, a neurologist and a endocrinologist. All my tests have been negative. My lab values are normal. I often get very dizzy, nauseous, very hot and my vision blurs. My heart rate is always over 100 (normal is 60-90) and I often feel like it's racing and feel it beating rapidly. Currently I'm wearing a heart monitor for 2 weeks to figure this out (I hope). Most of the doctors blow me off and say I'm dehydrated or that this is normal. The most recent doctor tells me it's due to stress which is bs because I'm not stressed out. If anyone at all has any insight please help me out. Thanks in advance and sorry for the super long post!! 😊