Hi winkingowl I started down this route too, working my way through various anti-dandruff shampoos but I think for me, none of them contained enough of the active ingredients to stop what’s actually causing the problem. Only Selsun did this, after years of trying. It’s currently out of stock however, so have reluctantly started the head and shoulders clinical shampoo which contains the active ingredient in Selsun (selenium suplhide). Early indications are not bad, so will see but am looking on Amazon etc for any surplus stock just in case it’s a longer wait til Selsun is back available on prescription.
Once it is under control properly I know I’ll be able to mix it up with normal shampoo.
It took me a long time to have this properly diagnosed and the bits I get on my face ears etc are relatively mild, so nothing like the scary google pix - but still, it is the same thing.
Sympathies to all with an itchy scalp, I do find it very miserable personally and have been so glad to get some relief from it finally.