Welcome. Best thing to do is get a formal diagnosis from your family doctor for your scalp issues, then treat them from there instead of guessing or assuming what the culprit is and self treating at random. Over the counter dandruff shampoos are not effective on all possible causes of your symptom of pruritis (itching) only on seborrhoeic dermatitis and usually only if it is mild.
In the mean time review your diet and lifestyle and make it as anti inflammatory and nutrient dense as possible. Also DO NOT scratch, instead use cold compresses to relieve the symptoms. Avoid heat - hair dryers, towel turbans, heat caps, hot water. All of these can cause or contribute to inflammation and histamine release which can worsen the pruritis.
2a-2c, medium texture, porous/ colour treated. Three years CG, growing out mechanical and chemical damage = breakage and very high porosity. Past armpit length heading for waist.
CO-wash: Inecto coconut
Treatments: Komaza Matani, coconut oil, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss ultimate volume, Inecto argan
Styler: Umberto Giannini jelly, Boots Essentials gel
Experimenting with: going back to basics