I wash my hair with head and shoulders once a week, by day three it itching. i don't have dandruff but my skin is very dry. can i wash my hair with apple cider vinegar?

See a dermatologist: You need to get the correct diagnosis before geting advice. Ask your physician to have you see a dermatologist. You can try T-gel shampoo until then.

Itchy scalp: Itching of the scalp can have several causes. Dandruff is the most common cause and is believed to be caused by a yeast. Head & Shoulders contains zinc pyrithione, which is an anti-yeast medication. For some, this works well. When there is no redness or scale in the itchy areas, one can try a tar-based shampoo that contains MENTHOL. This works for most persons, but is not so easy to find.