Nursing background here, and what actually strikes me about your situation isn't the symptoms themselves, it's how much time passed before you could put the pieces together. That's a systemic failure, not something on you.
On the facial changes: the popular theory behind that gaunt look is that quick fat reduction alters skin elasticity and volume, matching why it typically shows up alongside significant weight loss. But your case involves barely any weight loss, and researchers are now exploring whether this drug class might act on skin cells and collagen production in a more independent way, apart from fat loss altogether. Worth searching for one of the newer review papers if you're curious. None of this is settled science, so anyone claiming certainty about exactly what's driving your particular texture changes is guessing too, myself included.
On the emotional flatness: there's a name attached to this now, sometimes referred to as blunted reward response, and both doctors and reporters are paying real attention to it, beyond just forum discussion. The leading theory is that this medication class influences the brain's reward system, overlapping with the pathways tied to wanting food, so for some users overall pleasure gets muted, not just hunger. There's a solid writeup
