Dear Ergwyn,
I'm not familiar with why Cymbalta and Abilify cannot be mixed. Call a pharmacist (any pharmacist) because they often know more about med interactions than the pdocs do. Also, they probably have some data bases handy to check on these questions.
Your gp can probably put in a call to the psychiatrist. Or you could call the psychiatrist yourself.
You cannot make inferences based on the size of the dose.
Some drugs might need a high number of mgs to take effect and some might need only 3 or 4 mgs to take effect.
It's like comparing two elephants with two rabbits.
Or better -- comparing two animals and having no idea how big either one is.
How do you feel on the Abilify? Is it helping with sleep or racing thoughts or anything like that?
Mari