JD,

Sorry you are going through a difficult time at work. It sounds like you are a hard worker and take pride in your job. Good for you 🙂 

As Cleo mentioned it probably has more to do with what S has going on in his world. Perhaps you just happen to be in the crosshairs.
I am sorry to hear you are having a bad day. I know at my job, some days are great and some days are very trying and I wonder how I can do this until retirement. Ha 😉 But, then I focus on something positive, such as what I plan to do on my next day off, or what I get to do that evening after work. I try to focus on all the awesome things that I have outside of my work. Just remember that soon enough you get to start at a new University, which will be an exciting, new chapter in your life. This job you have now is just for the time being.

Try to remember that S might have some bad things going on in his life, but it doesn’t excuse him for treating you poorly. When he presents something to you such as criticism and you don’t understand, could you ask for better clarification? If you don’t understand what he wants/needs, ask him to elaborate. Perhaps, you can kindly set some the boundaries. If his voice gets loud, you can tell him that it scares you when he talks so loud, for example. Hopefully he’ll understand that you are trying to learn and do the best you can. Obviously you are 🙂 If nothing works, perhaps you need to have a conversation with J about it.

Take care of you and do something special for yourself tonight. Be around friends or family or maybe go see a funny movie, so you can laugh and smile.

Hugs and love to you my dear.