@Rdc2022 while it's plausible that your medication is the cause of your mood change, it's worth considering if there are other things happening as well.
Hormone therapy usually comes as the unwelcome tail attached to an already challenging beast. Dragging ourselves through diagnosis and whatever treatment is prescribed after that is physically and mentally exhausting, even if you manage to keep your act together through the process.
It's really common to have a bit of a crash when the pressure backs off.
Talk to your onc, but be prepared to be told you will need some more time to adjust to the meds. Have you considered seeing a counsellor? It's worth paying someone to be the recipient of suppressed rage if you can afford it.
If you don't want to do that, maybe your partner might benefit from some advice from a professional who has seen this stuff before. It took a couple of years for my partner to share their feeling about what living with me through BCV2 was like. That made me feel like shit and I wish they had received some support too. I was a complete cow.