Reduce your hours (if you work a lot of OT and/or are able to reduce hours, I know this isn't always possible) and find a hobby. Something totally different, that you LIKE to do. Clock/watch repair, fixing up vintage WWII era radios, kickboxing, cooking, photography, take a flying lesson (intro flights are only about $100), etc. There's a lot of stuff to do out there that doesn't have anything to do with EMS and can give your mind a break.
Me, personally, I don't find vacations "relaxing". A vacation is a temporary removal from my situation, and when it's over I have to come right back to everything the same way it was. Instead, make changes in your life. Doesn't mean you even have to quit your job, just find something else in your life to find some joy in.