Oh Beth I am so SO sorry
I know exactly how you are feeling about wishing you would have done something sooner. It had to be something that couldn't be avoided since he went from just being a little "off" to lying limp on the floor in such a short time. Sometimes the warning signs are way too subtle to notice until you look back. That's not your fault...it's just the way it is with animals sometimes. You took awesome care of Wags and I'm sure he knows it and appreciated the life he had with you. I'm also sure he knows you were there with him, loving him, when he passed. We MUST hang on to the idea that we will be rejoined with our loved ones when we pass...until then we just wait. And feel real crummy and sad for our loss. I feel bad you are in pain...I know this pain well and it just really sucks. Big hugs to you and just do whatever you can to get through it one little step at a time 