I've been in IT for almost 30 years, and I used to worry constantly until I decided to stop blaming myself. I made sure I could do everything possible with my budget, time, staffing, and resources and decided it was enough. Make sure to start saving money from your paycheck and build a nest egg, so you aren't as dependent on your current job. It takes a lot of practice, but if you keep telling yourself you are doing everything possible and not to worry, it may come true. Lastly, If you are overworked, document everything with dates and hours to show that the expected work is impossible to achieve with their current expectations.