I am so sorry for your loss , and feel your pain. It is my belief that your Bill is not lost forever. Below is something that I have always liked , and , I hope it will give you some comfort.
There is a bridge connecting Heaven and Earth. It is called the Rainbow
Bridge because of its many colors. Just this side of the Rainbow Bridge there
is a land of meadows, hills and valleys with lush green grass.
When a beloved pet dies, the pet goes to this place. There is always food
and water and warm spring weather. The old and frail animals are young again.
Those who are maimed are made whole again. They play all day with each other.
There is only one thing missing. They are not with their special person
who loved them on Earth. So, each day they run and play until the day comes
when one suddenly stops playing and looks up! The nose twitches! The ears
are up! The eyes are staring! And this one suddenly runs from the group!
You have been seen, and when you and your special friend meet, you take him
or her in your arms and embrace. Your face is kissed again and again, and you
look once more into the eyes of your trusting pet.
Then you cross the Rainbow Bridge together, never again to be separated.
Though they physically leave us ... they never leave out hearts. They will always be there for us within our memories ... and they will be waiting for us ... I firmly believe ... at The Rainbow Bridge.