Hi there! It also sounds like too little moisture to me. Especially when you say your hair already frizzes in the shower. Maybe your hair needed more moisture after the PT and a one time DT wasn't enough. You can test this by leaving protein out completely for one (or couple of) time(s) and using a moisturizing leave in before putting in styling products. Check if your mousse have drying alcohol in it or protein high on the list!
Hope your hair gets better soon!
2b-c/3a med/fine- low porosity- normal elasticity, BSL
2B/C-3A) fine - low porosity
Wash: Daily Fix,SMT, Kesham, Urtekram
RO: Motions CPR Li, Inecto Cocos co, AO GPB, KCTT
acv-rinse, sometimes honey-rinse
LI: coconut oil (winter), CJBC-LI
Styling: AVG, Etos Solid Power Gel, Taft gel, CJPP
Plopping~Pixiecurl diffuse~clipping