Welbutrin, Cymbalta, and Effexor are all SNRIs - serotonin norepinepherine reuptake inhibitors.
How were you doing on Cymbalta and
Abilify? Could the depression be caused by going off the Abilify by any chance? I don't know much about Abilify; it's just a tought to consider.
I'd definitely give Effexor more time to work. You are on a pretty small dose, compared to what most people need. Many individuals I know are on more, but DON'T play with that by yourself, please!