Definitions of unbalance:

• noun:   a state of disequilibrium (as may occur in cases of inner ear disease)
• noun:   a state of mental disturbance and disorientation
• verb:   throw out of balance or equilibrium

  Example: "The tax relief unbalanced the budget"

• verb:   derange mentally, throw out of mental balance; make insane

  Example: "The death of his parents unbalanced him"