It's a great loss. It's a loss if you didn't even like your spouse. If you did, it's just this side of unbearable.
It's been nine years for me and eighteen years for my best friend, and I believe of the two of us, I am doing better. When we knew he was dying my husband told me if I wasted time mourning, he would find a way to come back and kick my butt.
One can't NOT mourn, but there does come a time, for me at least, when the passion to live outweighs the sorrow, and we go about life again.
Nobody but you can know when that time comes.