Mid-lifeing

I think I'm going through my mid life crisis. I'm not chucking my marriage; did that already, but for different reasons. I'm not leaving home to travel the world or join the peace corp, although that does appeal to me. I am looking for a new direction, a new long term endeavor for my second half of life. This "crisis" has not simply come about because of the typical factors of age and phase of life, but more important it's been set off by a life-altering event - my daughter's medical trauma. Seeing and experiencing first hand the fragility of life continually brings to mind, "am I doing enough with my life, am I doing meaningful things, am I making a difference;" and at the risk of sounding like a teenager searching for my identity, "what is this life all about, what is my purpose here?" I might as well be back in the 70's again pondering life. This angst has hit me full force. It's what defines my mid-life crisis.