Are you sure all his stuff is out in the open?
Can you go and stay safe, or will it make you worse mentally.
There is a big difference between grieving and acting out from grief.
It can be a good thing for you, to both share your loss and hopefully even begin to talk about the good things about him. That's part of the process too.
Make sure you can leave when you know you need to, and drive or be safe afterwards, if you go.
You're mourning, whether you go or not.