I just put beloved cat down a day ago... help me please...?

It is very hard to recuperate from the loss of a pet, but just try as hard as you can to move on. Every living thing has to go someday, even if you do not want them to. Your former cat will not feel bad if you get another pet, just try to keep the memory of your cat somewhere in your heart and always remember her. Hope this helps, and I am very sorry for your loss.