Is it normal to feel overwhelmed and emotional after adopting a cat?

I adopted my cat yesterday and ever since she's been here I've been feeling completely overwhelmed. I hate feeling like this because I've been wanting a cat for years. I rigorously prepared everything and made sure everything was perfect before her arrival, made sure she has lots of vertical space and toys, but now that she's here I feel like I have lost my place. I have ADHD, and due to my depression I thought now would be a good time to adopt an emotional support pet but instead of making me feel better I so far have only had more negative feelings.

And it's not her fault, she's pretty much the most perfect, well behaved and affectionate cat I could ever wish for. I just feel like I don't have my own getaway place where I can hide and reload anymore. My head is constantly full and I'm on the edge of a flight reaction (fight/flight) all the time where I just wanna run off for a bit and cry in a dark corner🥲 I love her and play with her, cuddle her etc. but I truly just don't know what to do with these feelings... sorry if it sounds dramatic.

Edit: thank you SO much for all the supportive comments. It means a lot to me!!