Second kitty

So previous post was me planning on adopting a kitten. I have a 5yo female. This one is a 3mo male. I didn’t take the decision lightly either. I braught him home today. I have him in the bathroom separated from my female. She saw him briefly and could care less and she has smelled him on me. I got my female when she was about 7mo old and she wasn’t a crazy kitten. He has been more active. He hasn’t made a peep. He’s eating drinking and using the litter box. I was worried she was going to hate me. And so far it isn’t the case. The problem is me. lol. I think I’m quickly grieving for my cat being the only. I was in PetSmart buying stuff for the kitten and thought i was gonna have a panic attack. I have a million things going through my head and it won’t stop. Like ensuring my resident cat gets enough attention. And she’ll still cuddle with me. I want her to like him of course. And of course I’m excited but it’s almost like I’m not allowing myself to be. I just love my resident cat so much She got me through so much in life. As i am tearing up writing this lol. I overthink things completely. Anyone else go through this? If so what helps besides Xanax lol.