(Sorry for the rlly long reply)
I lost my cat of 7 years (literally my best friend and the reason I didn't kms several times) 5 months ago due to her running away from home after switching houses. she was scared of other cats in the area so she ran and didn't know the way back.
Slowly I grew to accept the situation but often I blame myself for not being a better owner, and for not appreciating her more/treating her better while she was still here with me </3 (I don't even know whether she's alive or not.. I just hope someone rescued my baby and that she didn't die of cold or hunger... )
About the pain of losing a cat, no, it doesn't get better, I still cry the same about her at least twice a week but I'm a sensitive person
It's okay to grieve your pet's death you can't really get over it if you don't cry it out
Right now what you should do, is give her the best life she could ever have! Be affectionate, give her treats, spend as much time together, play with her, give her a safe and clean environment
After she dies, there is no easy path. Yes, you could adopt a new cat, but dont expect her to be the same, you can love the new cat a lot, but your old one will always have a special place in your heart
Right now I'm thinking of adopting another cat too, but whenever I see a cat on the street or an owner taking care of his cat, I can't stop thinking about my poor baby, so I think it would take a few months to years for me to get into the mental state of getting a new cat
And yes, I loved my cat a lot, more than I loved anyone else </3