Brian and Dusty Leaf,
This might sound a little nuts, but i've found that focusing on healing often makes it more elusive. When we become too aware of where we think we're falling short... whether it is mental focus or success or health or anything... then the problem appears larger than it is, and as adam mentioned above, we can attract more of it.
By all means get out of the house and focus on other things. Learn to love yourself as you are (wherever you're at today), you really are okay, you know! Chase the negative thoughts away by getting busy for a while. One of the best things i've learned is that you can't get happy by doing the things and thinking the kind of thoughts unhappy people do. So model what happy people do and what you have done when you are happy... don't think about mental focus and negativity... think about a good movie, a good meal, gardens springing to life, helping others, being silly and playful, work projects and such, and this lack of focus will pass more quickly.
Good luck!