I am very sympathetic to your request, though our circumstances are different I have found myself thinking the same thing you are - how can I bring more happiness to my life.
I know you asked for something "preferably christian," but I think there is something nonsectarian that may be of benefit to you, if you are kind enough to read this post. If you read some of my other posts, you can probably guess, in the interest of disclosure. I also have an affinity for Buddhism. So, I offer two things, a way that was taught to me to calm things down by just sitting still, and a talk by a Buddhist nun (don't worry, the Ven. Robina Courtin is not your stereotypical wishy-washy love everything Buddhist nun).
First, meditation really helps and its nonsectarian, who ever wants to can meditate and it crosses all faiths and belief systems. Atheists, the spiritual and the hard.core believers all benefit.
Just sit in a chair, back straight, hands on knees, eyes open or closed, and breath comfortably. And kind of focus on your breathing. When thoughts come in, its ok, notice it, label it as a thought and go back to focusing on your breath.
The idea is to create some space between your thoughts. You won't stop thinking, so don't try to, but put a bit of space between one thought in the next. Don't be hard on yourself - if you have a bad thought, its just a bad thought then go back to your breath. In fact, don't even label good or bad, right or wrong thought - just go back to your breath. 5 minutes a day, that's all. And keep it easy going.
Guaranteed to bring results. If after 2 weeks, you don't feel any different, I offer a money back guarantee - no questions asked. ;-) Now this won't bring immediate happiness, won't stop any suffering, but I think it will help calm some anxieties and stress.
Lastly, Ven. Robina Courtin has some good things to say about ending suffering. Take it with a grain of salt, analyze it - if what she has to say doesn't make sense, no worries go about finding something that does. It's mostly nonsectarian stuff too.
Anyways, best of luck.
One last thought, a good book that helped me was Necessary Losses by Judith Viorst. She is a psychoanalyst, it helped me out, maybe it can help you if you are inclined.