How do I stop this grief?

I fell in-love with the most terrific woman 3 years ago. I lost her six months ago to cancer. She never told me her true feelings for me, but I know she cared more than she let on. She knew she was dying, but I stayed in denial to the very end. I love her still-death hasn't changed that. Is it crazy to still love someone and miss them even when they are gone. My grief and depression even taking an antidepressant is so that I can hardly function. I miss her badly and think only of the day when I can join her. Now, do not get me wrong, I do not wish to commit suicide, I just want her back!