I’m so sorry for your loss 
Losing a significant part of your life so suddenly is never easy and I understand what you’re going through.
My advice to you would be to take some time to honor his life. There have been some posts here in the forum about honoring the life of our beloved pets and I will try to grab some links for you. Then you can take it one day at a time, too. Start by cleaning up a bit of your altar space. Maybe just light a candle, some incense, or sit and meditate. Just take it day by day, even hour by hour if you have to. We’re all here for you if you need us 