Betta suddenly turner white and seems to be barely active?

Hey everyone! Me n my boy North have been fighting fin rot for a WHILE. I tried different medication, methods, food but nothing helped! After switching to some new meds he suddenly started turning white??

He also started to act less active recently. A lot of floating in one place, standing still, not hiding etc. is this tied to fin rot or is it just him being weird?

I feel so scared for my boy. I try my best to fix him but i still feel like im irresponsible:c