You know...I am thinking that this is an excellent question to ask your doctor or pharmacist. I can research a bit for you but they are going to know best.
I did find this answer about possible Lexapro and Adderall interactions which you might want to look at.
And here is a forum where people talk about any interactions between Ativan and Adderall.
It just gets hard to find information about interactions when you are talking about three different drugs together. Please do contact your doctor to ask this question.