Shampoo for the very allergic?

[CantSee4Looking]

I have recently developed a pretty nasty reaction to my normal shampoo (yep they improved it and changed the recipe )
Can anyone suggest a shampoo that will be suitable for some who is even allergic to E45? Main culprit is normally lanolin, but the shampoo was something else.

Also any advice to help my poor scalp that is currently incredibly red and feels like it is burning?

Dead sea stuff is supposed to be good - there's the Dead Sea Magik range in white bottles with blue writing, but also a different dead sea range (navy packaging) in Boots.