For those of you that were robbed of your children, how do you deal with the emotional pain? (i.e., no custody and/or living long-distance from children)

I do okay. I'm quite happy on average. However, sometimes (especially when looking through pictures of my children when they were younger), I get hit with an emotional gut punch and I feel my world undone. When hit by that wave of anguish, what do you long-distance, deprived fathers do to get past it?