I know this is partly caused by age, because I have lots of friends who have really suffered with the menopause, from about mid-forties upwards, but it's also just having children and working and doing every bloody thing, plus the pandemic was exhausting as well.
I feel a lot better now my children are older teens, I can exercise more, I'm not as harassed, I don't shout as much, I can take more time for myself and it's an upwards cycle. When I was mid-forties, with two demanding kids who could never be left alone, I felt worse than I do now, and I was heavier and just ate crap to try to give myself some energy.
Plus, the pandemic has meant even those of us not at the mercy of our hormones or smaller children feel burned out.
I don't know anyone who is having an easy time. I don't have your commute, I have a much easier job, and I have older kids who allow me more time for myself and I still wouldn't say I have amazing energy.
All the advice here is great, Vit D and B, exercise, and so forth, but if you are working out of the home 12 hours a day, then your ability to exercise, to relax, to order and take supplements- it's all going to be affected, so I would say start with the work issue, as that's the key to everything. You can only make real lifestyle change if your actual day to day lifestyle allows it- and yours doesn't seem to, and mine didn't when I worked f/t plus had littler ones.