Well, that's what I've found on stress at work:

'A Yale University study found 29 percent of workers feel "quite a bit or extremely stressed at work." Job stress is something we all employees face, and each of us handles that stress differently. Stress does not have to be a negative thing, and learning how to cope with and manage stress is imperative to maximizing our job performance, prioritizing safety on the job and maintaining physical and mental health.

Instructions
1. Know the symptoms of job stress. These are not limited to, but may include apathy, negativism/cynicism, low morale, boredom, anxiety, frustration, fatigue, depression, alienation, anger/irritability, physical problems (headaches, stomach problems) and absenteeism.
2. Maintain your perspective. While jobs are disposable, your friends, family and health aren't. If an employer's expectations are taking a toll on you, start looking for a new job/new employer.
3. Alter your existing job. If you enjoy working for your employer but your job has become too stressful, or even to monotonous, ask your supervisor adjusting your job to fit to your skills.
4. Take a break. If you're having an especially bad day and can feel the tension mounting, get away for a bit. Take a walk outside to get some fresh air while removing yourself from the negative situation. Finding some quiet, meditative time, even if for five or ten minutes, can reduce stress.
5. Talk it out. A great way to reduce stress is to talk it out, or "vent" to someone you're close to. Hearing yourself describe your concerns aloud may help you think about a new solution to your problem, and sharing your frustrations with someone else may reinforce the importance of seeking change to resolve the issues.
6. Develop an ally or two at work. Knowing that others in your situation "get it" can create camaraderie and relief.
7. Maintain a positive attitude, and stay away from those who exhibit negativity.'

I highlighted point 2 'cos that's something really worth remembering!
I wonder if there's any research on motherhood-related stress

Here's a New Year joke:
Quit smoking

A young man at a New Year's party turns to his friend and asks for a cigarette.

"I thought you made a New Year's resolution to quit smoking," his friend says.

"I'm in the process of quitting," the guy replies. "Right now, I am in the middle of phase one."

"And what's phase one?"
"I've quit buying."

And about mums:

Four-year-old Daisy and her friend were on the seat in front of their mothers in the bus.
"Look," said her friend, looking out of the window. "Moo-cows."
"They're cows," said Daisy firmly. "Moo-cow is a word for babies."
"Look," said the friend, turning round to her mother. "Cows."
"Yes, dear," said Mum. "Moo-cows."