I am glad you made a healthy decision to stay with your mother so you can cope with this easier.
Animals are family, give yourself time to grieve and accept what had happened. I am sure they had the best life, and you brought them the same joy they brought you.
This quote always struck me the hardest - "The difference between friends and pets is that friends we allow into our company, pets we allow into our solitude." This makes it so much harder to say goodbye.