Yes Lighten up would be better for your health and his, we are all doing a job and its hard no matter which one you do. Having been a PT sup we are used to being yelled at but it doesnt do either any good. The best way I made it through the day is the positive thought that this too shall pass, and soon Ill be out of here. dont let your job turn you into a mean person, its a job, it will get done, but how you feel about losing your temper will probaly trouble you, by your post, and it isnt worth the distress. Obviously you care and it never hurts to say, sorry I had a bad day, you will feel better, he/she will too, and if you werent threatening, or abusive, I wouldnt worry. Just remember it will end soon, its a few stressful hours in a day, and when you feel you cant do whats expected thats what makes you mad, but if it is overwhelming and your good, possibly they are whipping their best horse the hardest. and tomorrow is another day. Now how much work you are doing, check your PPh and see what is required for your position on the belt and handle it diplomatically.