Ways To Deal With Loss, Pain And Grief?

Its been nearly 3 weeks now and I cry everyday at the loss of my Murphy.
This golden angel was so remarkable in that he changed the lives of everyone who met him for the better. When his former companion a elderly lady went into a nursing home this part-golden lab, beagle and angel came into a house of all cats.
His kind, and gentle ways soon made him much beloved by them all.
His best friend a white cat Thomas misses him so much. I got set off yesterday when my sister got rid of the pillows that Murphy would lay on.
I have 8 cats so getting another dog right now is impossible I don't know what to do with this grief.
I have another sick cat Angel who was the companion of Michael a tux cat who looked like Cary Grant. We have two FIV cats who are so loving.(Thomas and David)
I saw an interesting video done from the spiritual stand point that animals do go to heaven. I believe this but I need to feel this in my soul.
I was also into animal rights a while back and still am in my heart. I want this to be a better world for them
I would appreciate any ideas to make the pain go away!