It sounds like you are in a rut where you think you don't have time to look after yourself. Everything and everyone takes priority over you. I did this for years. It was a massive mistake. You are already running on empty and you will burn out if you haven't already.
Just take a step back and realise that the world really will keep turning if you prioritise your own mental and physical health over everything else for a few months. You think you can't but you can and must. I didn't. Then I caught really bad flu and got post viral fatigue that lasted three years and I had no choice. guess what? The world coped. DH stepped up. My children survived.
First - if you do anything voluntary - ditch it - all of it. All school committees, community work, helping out mates or family with this and that. Say you have to take a break due to health scare ( you don't need to say it's an imminent nervous breakdown) and you are withdrawing from all plans immediately.
Explain to DH how close you are to burn out and that you need to get well. So for two weeks, he needs to sort out the DC in the mornings for the first hour. You will get up and go into a room, undisturbed and spend the first hour of the day on yourself: 15 mins yoga, 15 mins meditation, 15 mins journalling, 15 mins prepping a healthy breakfast that you eat in peace. Or a healthy lunch in advance so you don't shovel down biscuits at 3pm when you are suddenly ravenous and realise you haven't eaten all day. If mornings are truly impossible, claim this time every night. But he needs to answer every call of 'Mu-um' during that hour, And you need to ride out the guilt until they start shouting 'Daa-ad' as often as they shout for you.
Start with one session a week - one evening class of yoga or meditation or dance that would ease your stress. Just go. Get into that good habit.
At least three evenings a week do super easy food that needs 5 mins prep. Fresh pasta or gnocchi or tortelloni with fresh pesto or sauce and salad; supermarkets always have offers on Indian takeaway style dinners for a fraction of the cost of takeaways, and if you pick the right side dishes, they can last two nights; oven baked fish and chips with peas. One night a week cook something that can double up next day - spag bol sauce on day one is chilli or shepherd's pie on day two. Roast chicken one night, chicken wraps next night. Never spend more than 10 mins prepping family dinners. Get DC to lay table and everyone helps clear up.
With the bedwetting, DS2 was the same and it was every single bloody night. Broken sleep, year in year out. Physically arduous.You have my sympathy There's nothing you can do. Some boys just don't produce the necessary hormone to stop night wetting in their toddler years and so it doesn't kick in until puberty - it can't kick in any time between. I chose not to go down all that Eric route of alarms because they don't work. And desmopressin is really not healthy for them on a regular basis so he save that for sleep overs and scout camps.
I used to double up the sheets: protective layer, sheet, second protective layer, second sheet, and put an adhesive bed mat on the underside of the duvet, where it touches his PJs. Also he needs to wear night pull-ons under his PJs. If he wets the bed badly, just strip off the top sheet and protective layer, and the clean dry stuff is underneath. Peel off the adhesive pad which should have protected the underside of the duvet, and turn the duvet over if it is a little damp, so the dry side is now touching him. Get him to strip off and into clean PJs. Let him shower in the morning. I was blunt about this if he didn't want to. I'd just say - your bed was wet, you do not want to smell of wee at school. Jump into the shower. Show DH this routine and get him to set it up - the double layers, the correct positioning of the adhesive pad etc, and make sure he does at least 50% of the bedwetting from now on. That includes sticking the wet stuff in the machine, hanging it out and resetting the bed for the next night. It is a hell of a lot of work and it should be shared.
Incidentally, late bedwetting and struggling socially can be signs of autism - they were for my DS. Worth checking on this. Better to be diagnosed than not. And being the parent of an autistic child is extra exhausting in a way you don't realise until you come through it.