What antidepressant? and at what dose?. Also, whats your dose of abilify? Because anti-depressants can affect different NT's and regions of the brain. Have you asked him or her why?
Is it an SNRI, SSRI, NARI plus a few that have now come out. That are targeting 5HT7 also. Which is relatively new in the serotonin class, Brintellix!