For the following , U will need to consult your Doctor or Dermatologist.
Corticosteroid creams are sometimes prescribed to decrease the inflammatory reaction in the skin. These may be mild-, medium-, or high-potency corticosteroid creams depending upon the severity of the symptoms. If itching is severe, oral antihistamines may be prescribed. To control itching, the sedative type antihistamine drugs (for example, diphenhydramine [Benadryl], hydroxyzine [Atarax, Vistaril], and cyproheptadine) appear to be most effective. AS U can see the names of the Treatments may be too complexed, so seeing a GP may be the recommendation.
Try Selsun Blue as the shampoo. (its often effective)
Use also Laundry soap instead of normal bath soap or ordinary shampoos. Laundry soap, may sometimes be referred to as Sunlight Laundry soap..It is not necessary to buy this, as U can use the generic type which is often called>> Kerosene soap, available under some store brand names in supermarkets or at hardware stores.
ANOTHER is called PINETARSOL, in tubes and small to medium plastic bottles at Chemists/Pharmacy/Drug Store.
Pintarsol is a soap substitute and has the affect of easing the Itch,,takes a few minutes to work.
Releives Itch in the skin also..avoid getting it in the eyes..
References :
medical research

- bathing using warm, not hot, water and a very mid soap
- using a cream or petroleum jelly based moisturizer on wet skin after bathing or washing hands.
- moisturize throughout the day as the need arises. Avoid using lotions as they tend to dry out the skin
- pat excess water from skin after moisturizing as rubbing irritates the skin
- wear cotton clothing
- avoid the use of detergents, fabric softeners and dryer sheets with perfumes and/or dyes

There’s a really great article on this website about how one woman with severe eczema was finally able to beat it: http://www.beateczema.com/?hop=4safetynow
References :
One woman’s struggle to beat eczema
http://www.beateczema.com/?hop=4safetynow