There's a Garth Brooks song titled 
Much Too Young (to Feel this *#$* Old) which is exactly how I feel most days.  Instead of waking up feel rested; when I wake up my back hurts, my hips hurt,  I'm covered in bruises and feel like a walking zombie.   I keep thinking how nice it would be to feel normal, but I honestly can't remember what normal feels like.  Then the part of my brain that likes numbers went into overdrive and I  came up with a list of what my poor body has been through lately.
In the past 3 1/2 years I've had anywhere from 1 to 3 other people living off my body.  That brakes down to approximately 23 month pregnant or nursing twins,  3 months nursing twins while pregnant and 16 months pregnant or nursing 1 baby.
In that time a typical nights sleep consists of about 6 hours of sleep with an average of 2 awakenings for any combination of  taking care of kids or nursing a baby or bathroom breaks.
1 night a week I'll spend a good 30 minutes to an hour curled up on a toddler bed trying to get a toddler back to sleep.  (sometimes more if I happen to fall asleep that way).
I've gained 40 lbs, lost 30, gained 40, lost 45  (and still have lots more to lose).
I've had 2 C-sections (in other words I've had 3 people pulled out of my uterus).
I spend a significant part of my day doing chores while carrying a baby/toddler on my hip.
I have probably climbed up and down the stairs  20+ times a day and at least half of those I'm carrying anywhere from 16 to 50 pounds of baby/toddler (not to mention the  extra weight mentioned above) .
I spend about an hour a day wrestling or chasing kids that don't want to come inside, get their diapers changed,  stay by the stroller/grocery cart.  (Please tell me I can count this towards my aerobic weekly goal).
And last but not least an hour a day where I'm the human jungle gym (or furniture if there are sick kids in the house).  If I get down on my hands and knees to clean up, someone is going to jump on my back.  And if I sit down, someone will be climbing me.
Somehow after reviewing this list that tummy tuck and boob lift don't seem all that scary anymore.