One of my boys self-identifies as a BuMo--a Buddhist Mormon. When I asked what took him to this place, he said that in his experience, Mormonism doesn't address the problem of suffering satisfactorily--at least for him. And, in fact, there's a lot of pressure to BE HAPPY in our culture: Adam fell that man might be and man is that he might have joy. You can, of course, talk about the difference between "happiness" and "joy," but it's not likely to make you feel any better when you're suffering both physically and mentally.
Anyway. I've been thinking about this lately, and a lot of what my son says makes sense to me. Feeling happy is fab. I love happy! I love happy so much I want to marry it! But when you don't feel happy, should you really feel guilty about that?
Why not just make peace with your sorrows and acknowledge that yes-- they have a place at your dinner table, too.