I have the same issue! I was started on beta blockers for a different heart condition and it helped to control the syncope episodes. I still have episodes, but they're not as frequent or as bad as they used to be. As far as triggers go, do everything you can to reduce the impact of unavoidable triggers. put a space heater in the bathroom when you shower so the room isn't as cold when you get out, always carry a small fan and/or a bottle of water, wear lots of layers, just small stuff you can do to hopefully make the syncope a little easier to deal with

Yes! I have a few ideas that helped me dramatically! If you haven't seen a neurologist, do so. Water alone isn't enough. Find an add in powder high is salt such as Liquid IV. Unfortunately they are a little pricy. Do an analysis on other areas of your health such as you sleep schedule, physical activity, and mental health. My heat sensitivity decreased after a few sessions with a really good therapist. The trigger is real, but my fear of heat also brought on more reaction that was required. My life because almost normal when I finally achieved overall good health. Unfortunately if feels like I'm walking a balance beam, if I forget to exercise, or eat a big surgery meal, it fall off and suffer. But I recognize that my condition is forcing me to live healthy and all humans should be doing that anyway.