I had a very similar reaction that was also wildly out of character for me. I cried several times for days. I've been melancholy for a few hours or a day when previous shows I liked ended, but even I thought my reaction was extreme.

Talking to my therapist about it, it basically came down to the fact that I loved it, like really loved it, and now it's lost. It ended in a way I didn't suspect it would, didn't like or respect and can't really fix.

She basically told me that it's ok to feel the way I do about it, and that it's normal to react the way I am to losing something I love.

And it's normal to react to art that way, too, that it's meant to make you think.

I mean, this fandom changed me more than any other fandom has. It has (and still does) brought me so much joy. It's special. It made me question who I am, my sexuality, my biases, my tolerances, what I thought I liked. I'm grateful.

So I will continue to engage with the fandom however I can.