It's not PPD, it's living in the past...
There are two ways of ensuring ongoing misery in the midst of quite a neutral, pleasant life: focus on and regret all the things past, and; focus on and worry about all the things future.
You're thoughts are not directing your life, but also you are not directing your thoughts. When you catch yourself reminiscing about what is missing from your life, and how great it was then (betcha a dollar you didn't think so at the time!), bring yourself gently but firmly to the present moment. What is happening right now? How does it look? What do you have?
Because otherwise in 10 years, when you're dealing with a tween who has different views of the world than you do, who is not cooperative, obedient, thoughtful, grateful or wonderful ALL THE TIME, you'll be sitting there wishing you were still sitting here. You're missing your real life, all the time you're spending in the past or the future.
at 8:39 PM on Dec. 16, 2010