Hi,
First of all, I'm so sorry for your loss. I can tell from your post how close you and Jade must have been.
Seeing sights of the person who has died, especially so soon after the death is common. However, I am concerned if these visions and thoughts are very negative towards your life. I can't imagine how hard it must be right now but I can promise that in time it will get easier to live with. You will never forget her and there is often a permanent change but these extremely negative emotions can ease.
Are you seeking help at the moment? Do you have a T? It might be worth looking at seeing a grief counselor if you can. They can help you look at what you are experiencing and begin to work through some of the pain.
And also please remember you are never alone - this forum is always here and you can always rely on us when you are feeling isolated