Anyone know of an alternative to using shampoos?

I've tried them all and I have a chemical/allergic reaction to them and then have to go on prednisone.

you said you were allergic to all shampoo? have you tried all the natural shampoos? They have only natural ingredients in them. no toxions and no chemicals. If you are interested let me know.

I am also allergic to Essential Oils.

If you are allergic to some shampoo...Look for a shampoo that has a mild ingredients on it that will suit on your scalp.