I really struggle with anything that is out of my control too. I try to do everything I can to ensure the best outcome so for example, someone has offered to give you a lift to the hospital for an appointment at 11am. You can’t guarantee they will show up in time but you can drop them a text or call to remind them what time you need to leave and allow a little extra time for traffic. If you’re like me you’ll also have a back up plan of how to get there and the time it takes via other means too covering all the bases. I am a bit obsessive with my safety behaviours but if I know that I’ve done everything I can in a situation that is a slight comfort.