Hey Tatiana, girl!
There's a duality with happy and sad moments, so you describing things as a roller coaster certainly rings true. Like, how can you understand sadness, unless you've also experience joy? Or vice-versa.
I'm glad you talked to a seasoned trans woman! That's great to hear, and I do hope she can help support you in real life, too. And I can understand self-destructive behaviour, at least, that is what I think you might have dipped into after talking to her. Because it was so nice and encouraging, you felt undeserving, and so flipped the good into bad and it made you very depressed. But you are deserving, and I'm so glad to hear that you seem to have bounced back from it!
I used to hate looking in the mirror, too, but now I'm actually indifferent on it. Like you, I don't see the face I've hated for so many years, I see the potential feminine face that I will grow into.
Family stuff can usually get pretty messy, I am glad they removed the cancerous cells because the big C is really really hard to deal with for many of us... And I'm also glad that she wasn't scheming with your mother, I hope her support only grows more over time. And with it, you grow more into the woman you are!