Because of you I vacillate between howls of laughter and a deep deep depression.
From the guardian.co.uk
I do not vacillate that I would not like to forget about that subject completely.
From the iftomm2003.com
America's lack of fast-track has given too many countries the excuse to vacillate.
From the economist.com
When loves fades, our feelings vacillate between sad, uncomfortable and angry.
From the au.news.yahoo.com
I vacillate between biology, business, astrophysics, Spanish and journalism.
From the dailyherald.com
I vacillate between these lifestyles on a more regular basis than I'd care to admit.
From the blogs.psychcentral.com
An alert man can make his wishes known at one point, then vacillate from hour to hour.
From the sltrib.com
Most people with bipolar disorder will vacillate between very high and very low moods.
From the us.cnn.com
Others do not, while some vacillate between classical and regular plurals.
From the en.wikipedia.org
More examples
Hover: be undecided about something; waver between conflicting positions or courses of action; "He oscillates between accepting the new position and retirement"
Fluctuate: move or sway in a rising and falling or wavelike pattern; "the line on the monitor vacillated"
(vacillating) vacillant: uncertain in purpose or action
(vacillation) hesitation: indecision in speech or action
To sway unsteadily from one side to the other; oscillate; To swing indecisively from one course of action or opinion to another
(Vacillation) The prominent feature of weakness of character.
(v.) to fluctuate, hesitate (I prefer a definite answer, but my boss kept vacillating between the distinct options available to us.)
To waver in mind or opinion; be indecisive or irresolute
Be unable to decide, swing back and forth * Love Triangle