You are getting wise advice here.
Divorce is not something to rush into and certainly not something you want to regret.
We need specifics.
So you both work full-time and share the load?
He goes out how many evenings and for how long?
Because if he is out several evenings then you are doing it all.
It is very hard to work full-time and face into an evening of catch up and bed times....alone.
That IS relentless.
So be honest as to how many evenings you are on your own.
Besides the above, this could be a situation where it is up to only you to fix things.
Talk to your GP, are you possible stressed/depressed, a bit early menopausal, which can lower your moods for years without you necessarily thinking menopause.
Life when they are very small is relentless, but you have to find some joy in it for yourself.
What are your gratitudes?
It may sound hokey but when I got a bit low and when I felt overwhelmed with 4 children, a husband travelling and being tired, I would take a few minutes to remind myself of my blessings, of which I had many.
Healthy children, good husband, no money issues, my own health, dear friends......they would have been my main ones.
As an absolute priority you need to do something for you every week.
I remember a woman I knew vaguely 15 years ago saying that she went for a walk several evenings a week with a friend. She said it was their life saver, cost nothing, good for her MH and general help and it was the only thing she did for herself.
Would you and your neighbour start that?
You give so much to your family, you now need to listen to your body and mind giving you a real warning that you need to look at your self care.
Wishing you well.