Get a new doggie. It won't take the place of Flossie, but I'll bet it will make you feel better. A new baby doggie can't make you feel worse. It will help you honor Flossie's memory - you can tell the new pup all about her, and then the new pup will give you doggy smooches for being such a good human. Flossie would be very happy to know you are happy too.
And give Himself a hug for me. He's paying attention to your feelings. Good job!