Firstly, I want to say I'm very sorry for your loss.
Grief is never an easy thing to deal with and different people do it different ways. Whenever I lose a bun, I find it very important and very therapeutic to write a memorial post on here, in the Rainbow Bridge section of the forum. It helps me remember the good times I shared with the bunny and the sad. It also provides a post to return to whenever I am feeling particularly sad and missing that specific bun. I don't think you will be forever sad, but hopefully there will be a time when you can look back on the past with your bun in a bittersweet way. Just because they've passed on, it doesn't mean you won't stop loving them and missing them, but time can make it easier to deal with.
Take care of yourself in this time. xxx