Eczema covers 90% of body What can we do

My 9 yr old son suffers from eczema over most of his boddy- not on his face lower arms and feet but all over trunk, back legs shoulders. When not weeping and inflamed it feels dry and warm and flakey.
It appears worse at different times and sometimes appears to be clear leaving skin cooler and in better condition until the next attack - 3- 4 times a year.
Eczema started at 3-4 months old when I stopped breast-feeding.
It is worse usually Autumn and spring. Cannot go in sea because it is too painful but does swim in pool three times a week- figure it is important to learn to swim even with eczema!
A real outdoor boy who is very slim but agile and athletic- football, running climbing trees etc Very sociable giving and thoughtful has many friends and is popular with adults and children. Has an older brother who is very accademic and feels that he will not be able to live up to his older siblings abilities. Doesnt push himself forward or acknowlege his achievements loudly if at all.
Does get warm in bed
No aversions to speak of has a good varied diet though has nose bleeds and we used vit.K sucessfully. Loves fruit- can eat quite tart fruit- even lemons! Eats 6/7 portions of fruit/veg a day some cooked some raw. Doesnt like nuts much or rice, potatoes orcouscous but does like pasta meat veg etc Not fussy- will eat choc but can live without it. Does like sweets but only has very few.
Has had chicken pox but very rarely anything else, few colds or stomach upsets quite strong but skinny.
Doesnt like to dring water so I have to remind him constanly We have chiropractic care but not helping with skin. Have seen kinisiologist and use iodine for three months which helped slightly. Have seen homeopath many years ago who gave us sulphur in a bottle. No help at time.
Sleeps well bed-time 8 0 clock wakes up 7.30 rarely/never wakes in nightfrom birth.
Can anyone help, the doctors have prescribed creams which I cannot bring myself to use