Oh OP, your last post made me truly sad.
I'm sure your parents would want to know how truly awful you're feeling, and yet again, you're putting others needs and wants above your own.
Please, please tell someone how you are feeling and how much you're dreading your 'DH' returning.
Your mental health is absolutely your first priority for both you and your kids. All the faking and lying and contorting yourself to ensure everyone else's happiness HAS A COST.
I truly understand how you want to keep the peace and keep the wheels of 'normal life' turning, especially over Christmas, but you NEED to vent to someone. Maybe the anonymous phone lines e.g the samaritans ? You can call them and cry, scream, vent and talk about everything, but without any risk of 'upsetting the apple cart' meantime ?
At least you can chat to someone who is totally impartial just so you don't either implode, explode or cave in.
You are questioning your whole way of life, realising it is not 'normal' and as also not working for you in any way. All that is HUGE, and will take time to think and to plan and to decide what you want to do and how you will do it.
Doing cleaning now is both avoidance and capitulation, so STOP CLEANING and use the time you have to speak to someone.
I'm hopeful that just voicing your concerns and feelings to someone (even anonymously), will release some pressure on you, and give you the strength to get through the holidays.
You are at a crossroad in your life, and once your DH has left for work again will be soon enough to begin any changes you're thinking about.
I wish you peace (strength you have in bucketfuls, but you need to obtain peace). My thoughts will be with you over the holidays. x