After fretting all night about the problem and Googling everything I could think of, the only answers I got were to move the animal to a different area or let their body get used to it and just let them get bitten. It will be better next year they all say.
I remembered that when we were little and fell in poison oak or got the chicken pox, my mother would put us in a cool bath with bicarbonate of soda and it took away the itch and had a very soothing effect for a few hours. This morning I went to the stable to feed and see how my poor Frisona was doing, she was still going crazy but at least came in to eat. I gave her a sponge bath with cold water and a lot of baking soda and I had a very relieved and grateful horse that was able to relax enough to enjoy her breakfast. I will have to do it several times a day but at least it works. Distilled or white vinegar in water is another good remedy for itchy skin and bites.
These remedies work on all of the animals and on people too.