Grief over recently losing a pet?

I recently had to put down my 7 year old corgi due to seizures & a brain tumor. She was my absolute baby. It has been about a month and I am finding myself crying myself to sleep almost every night over her. I start to cry every time I hear her name or look at anything that used to belong to her (bed, food bowl, etc.). She was so full of personality & I really miss having that daily interaction with her. I feel like im just empty now. I keep her ashes & her collar in my room in a special place and I bought a locket with a picture of her in it. These things somewhat helped but I am finding myself having incredible grief over her & I think about what I could have done to save her or help her every single day. I know she had her place in my heart (as do all my pets), but I would like some tips on how to start recovering.