Not sure if someone else has mentioned this, but are you allowed to vary the length of your lunch break? I'd personally find it exhausting to drag it out for so long because it keeps you at your workplace for an extra hour. I'm not saying to give it up entirely, but having an extra half hour at home to unwind could be nice. If you want to (or have to) keep it a full hour, going on a walk like others said is a good idea.
As for sleeping immediately when you get home - do you typically sleep well at night when you're less anxious? A crappy mattress can make it impossible sometimes, and if you've had the same stiff brick for 20 years it might be worth replacing. A quality mattress will last years and is worth it, considering how important sleep is for your overall health.