Sorry to read this. I am 54 now but had chronic childhood eczema (cured by my parents taking me on holiday for sun and sea at age 7 after being hospitalised with my eczema). I have the occasional big flare up (having one this year, I think menopause related).
I've tried everything over the years, been diary free, had allergy testing, tried Chinese medicines, tried homeopathic remedies etc.. Tried all kinds of moisturisers and currently have a big basket full of them at home! I am allergic to most of them, they actually make things a LOT worse for me.
What works for me won't go down well with a lot of people but the alternative of living with sore skin is worse. Topical steroids and nothing but the steroid during a flare to get on top of things fast. I react to every single moisturiser I put on my skin when it's angry (I believe this is not uncommon). So I go against the advise given out by GP's and dermatologists to moisturise while using the steroid. I use a moderate steroid for a few weeks then taper down the ladder (this is what I am doing at the moment) and then stop.
Other things that work for me:
I have only sea salt in the bath
I try to use SLS free shampoo and conditioner
Swimming seems to help and my local pool now use a mix of chlorine and salt which is brilliant
A holiday in a warm climate with sun and sea helps (and usually clears it)
I take 2 or 3 antihistamines a day (obviously check with GP regarding this for little ones)
Keep rooms cool. Heat definitely aggravates my skin
Soft, cotton clothing next to skin
I use laundry balls - not washing powers at all
No scents in house
I keep my nails really short
Distraction. Sport, crafts, anything you do with your hands
I have worked out that the peak itch time for me is when I remove my clothes before bed. So I try to have a nice cool, calm, salty bath, dry myself, change and then relax for a while but really important to keep cool and relaxed at this time before bed.
I have used topical steroids on and off for my entire life with no withdrawal, no thin skin etc.. My eldest son as a baby had a flare up and I immediately put hydrocortisone on it to clear it. He is 21 now and just gets the odd patch on his inner elbows.
You do learn to manage it but I just want to say not to fear topical steroids. They get an awful lot of negative press online but they do work - brilliantly.
I also want to say that as a child, the whole thing was worse for my mum and dad. My mum never stopped worrying about my skin but I go for decades sometimes with very little eczema and when it does appear, I know how to manage it.
Good luck and I hope you can find a routine that works.