Sorry to read this. Same thing is known to happen to susceptible individuals with sulphate surfactant shampoos, experts believe that is due to inflammation at the follicular level and I do wonder if you are experiencing a similar effect as you admit to being rather enthusiastic. Of the people I have read about experiencing this phenomena, a good number have pre-existing scalp and/ or other inflammatory health conditions.
2a-2c, medium texture, porous/ colour treated. Three years CG. Past bra strap length heading for waist.

CO-wash: Inecto coconut/ Elvive Volume Collagen
Treatments: Komaza Care Matani, coconut/ sweet almond/ fractionated coconut oils, Hairveda Sitrinillah
Leave in: Fructis Sleek & Shine (old), Gliss Ultimate Volume, various Elvive
Styler: Umberto Giannini jelly, Au Naturale styling gelee
Flour sack towel, pixie diffuse or air dry.
Experimenting with: benign neglect