My dear departed mother graduated at the top of her class in 1928 from the Maine Eye and Ear Infirmary (which evolved into the Maine General Hospital which in turn has become today's Maine Medical Center) in Portland, Maine as an R.N. (Registered Nurse) and became the company nurse for
Burnham & Morrill which produces the well known line of
B&M BRICK OVEN BAKED BEANS. One of the many pearls of wisdom that she raised me and my two older brothers with is the following: "
Cleanliness is next to Godliness!" In other words, do not be afraid of soap, shampoo, and water! Anyone who has served in one or more branches of the military in the United States can attest to the fact that showering with soap and/or shampoo and water every day is a requirement when living in close quarters on base or on board a ship for obvious reasons of personal hygiene, and has been routine for hundreds of thousands of military personnel for decades with no harmful effects!
With that in mind, the following quote from one of the many articles available on the internet about dandruff, which appears to be what you are dealing with, is right on point:
Changing hair-care routines: There is no "right" shampoo or
conditioner. What is more important is the frequency with which
these agents are used. As a rule, the more frequently one
shampoos, the better the result. Seborrhea and dandruff are not
caused by excessive shampooing "drying out the scalp." ...
You can read the entire article at the following Link:
https://www.medicinenet.com/seborrhe..._help_dandruff
However, before trying any of the medicated solutions, you may first want to try the daily washing of your hair and scalp and affected areas with this particular bar soap -
Dove gofresh rejuvenate beauty bar with pear &
aloe vera scent. You can read about it at the following Link, and be sure to scroll down and read all the comments, some of which I think you will find helpful:
https://www.walgreens.com/store/c/do...346195-product
I suggest you try that for at least ten days. However, from what you have stated, it sounds as though you may benefit from adding some complete protein to your diet as well as a little fat. Remember, your skin is composed of protein. One or two hard boiled eggs a day as well as a 1/8 inch thick tab from a stick of butter and a tablespoon of extra virgin coconut oil (you can harden it up in the refrigerator and then take it out and let it warm up and soften to the consistency of butter and use it like butter-it's delicious that way.) would provide both the complete (with all essential amino acids) protein and the fat which is needed for your body to metabolize fat soluble vitamins. In fact, your body's current inability to do that - metabolize fat soluble vitamins - as well as the lack of complete protein, both due to your restricted diet may be the root of your problem.