I'm so sorry that Oliver has passed on.
Now he is free from pain and flying high above, looking down on his loving mum who cared for him better than anyone could since day one. Although he is gone now, he will live on in your heart and your memories.
I can't imagine what you're going through. You have my deepest sympathies.
Fly high and rest in peace for all eternity, little Oliver. You will be missed greatly.