“Changing jobs can be an adrenaline-filled time," said Leigh Steere, cofounder of Managing People Better. "And when the adrenaline wears off, it's not uncommon for an employee to experience a funk and begin to question, ‘What have I done? What have I gotten myself into?’"

Know too: you can quit and live to tell the tale. Employment lawyer Donna Ballman, author of Stand Up For Yourself Without Getting Fired (Career Press, 2012), said she is living proof. Ballman elaborated: “When I first became a lawyer, I quit a job after 90 days or so. I accepted a job as a lawyer in an area of practice I thought I would enjoy. I both disliked the area of practice and my nightmare of a boss. But I had turned down an offer from another law firm and they said they really wanted me and if things didn't work out I should come back and talk to them. So I took them up on it.”

Ballman’s tale also underlines a point that should give the unhappy new employee cause for optimism. Searching for a job is a skill that is honed over time. The job seeker who lands an offer has refined the skill. But that means that skill is still on hand, to be tapped anew, at least in the near term. Don’t expect those skills to carryover for a search five years later -- much has been forgotten, plus the tactics may have changed. But three months later? You bet. You are good at this; be confident about going forth and doing it again.

Word of advice: don’t make impulsive, rash decisions.

“Unless something occurs that is absolutely beyond the pale, I advise people to give their new jobs at least three to six months before making any drastic moves," said Andrea Berkman-Donlon, founder of personal brand development company The Constant Professional. "This has nothing to do with how it will look on a resume, but everything to do with the learning curve.”

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