I'm with you on the stress thing. I have one about to graduate and I am throwing her a small party just before graduation, and we are leaving for Disney right after. On top of that, I have two others involved in cheer & soccer plus DD18 is stressing me to the max.
What I have been doing is trying to do things for me. I have been working in the yard, having a glass of wine, and planning this Disney trip. If I focus on all of the stresses in my life I would be dead.

I have realized that I am not in control, God is, so I turn it all over to Him, and I just do what I can.
As for the party thing, I took the stress away by having some of it catered. I will do the simple things, and I have a friend coming to help me as well as my mother. We are having a simple get together, nothing fancy. Now with the cleaning, I would make a list and divide and conquer. Give each person a responsibility and have them do it. When I am in a pinch, this is what I do. Then I go behind them and make sure it's done.
As for the school work, that comes first to me. He would be missing whatever it was to get that finished especially since he had plenty of time to do it.

to you! Maybe a night out alone or a weekend away after graduation is just what you need to get your marriage back on track. We do this a lot, and it really does help.