Itchy Skin Cures

I have chronic itching. I have tried the "very expensive" prescription that my MD gave me, but my mother told me to try:
1 part tea tree oil,
2 parts olive oil
and dried oregano.

I spray it on and not only does it calm the burning and itching but it moisturizes my skin. I haven't had to use my expensive skin cream or take Benedryl in a long time.