Boyle, like most financial advisors, counsels her clients to diversify their investment holdings and manage their risks. Large-cap U.S. stocks may continue to do well this year, but that doesn't mean investors should increase their exposure to them.
"Our job is to communicate to clients the risks they take when they concentrate in an asset," Ghodsi said.
"Stick to the financial plan, and don't get too excited or too depressed." That kind of advice is "what people pay us for," she added.
Read MoreBefore splurging, consult an advisor
The anxiety about performance, however, doesn't just affect investors. It's a problem for advisors, too, according to Ron Carson, a CFP and founder and CEO of Carson Wealth Management.
Those advisors who concentrate solely on investment management rather than financial planning for clients are getting killed by the market indexes and struggling to prove their value to clients, he said, and it's tough on morale.
"Smaller advisors in the mode of just picking funds or packaged products for their clients are having a hard time justifying their fee," said Carson, who also founded the Peak Advisor Alliance, which provides coaching services for financial advisors.