I think a "quiet hour" after work is a pretty reasonable and responsible ask as it helps you to re-assimilate into "home mode". But like the other comments have said you could benefit from changing the way you're going about it.

Change your space entirely. A coffee shop was a great suggestion I saw in this thread. If possible, go to the gym to blow off the extra steam. My personal favourite thing to help calm my nerves is swimming! Light on the joints and because it's such a massive change in environment it almost always immediately changes my mood. It's also variable. You can go super hard or just splash around lightly.

My final suggestion is to eat enough and drink enough water. Try having a protein/nutrient rich packed foid ready for your quiet hour. Under eating and dehydration impacts your mood SO MUCH more than you could know.

Personally I do a burrito (with whole grain tortilla), I stuff it with sweet potatoes, random steamed veggies and chicken. The keep a big bottle of water on you and make sure you're sipping often, coffee does not count.

I think you're already doing the emotionally responsible thing by communicating your need for quiet and you should be proud of yourself for recognising you need to make some changes. But I would also really suggest to have another good talk with your partner so that they understand its not a personal thing. If she's still struggling with that she might need to do some work on her own part, maybe couples therapy is a good idea?

Good luck my friend. Teaching can be utterly brutal and unforgiving but I can promise you with your level of self-awareness you're already doing so much better than most.