I have copied your story from your profile so members can read through it while trying to reply,
Troubledgrey wrote....
Cleo, my troubled Grey, came to me about a year ago in dire conditions. My dad, an animal lover, but also a doctor working 12 hour days, bought Cleo about 13 years ago when he/she (sex unknown but I refer to Cleo as a he) was just a chick. My mother, not so much the animal lover, was left to care for Cleo. Things didn't work out so well- Cleo fell in love and my mother became increasing disgusted with the constant poop and feathers about the house. Nine years later, Cleo ended up in the basement. A series of mishaps led to the permanent loss of all of his flight feathers on his right wing. Slowly, Cleo lost weight and sunk further into depression. I came home from college to see his state and convinced my torn father to let me take him back to school with me. I'm trying so hard to help him back through recovery but I need more help!!! He's on valium and paxol but continues to jump unprovoked from his perch. He has bad habit of dive bombing from his perch unprovoked and not flapping his wings to break the fall. A very, very unhappy bird! Anyone who is interested and has experience with traumatized birds, please, please, please contact me!!!
Firstly how long did Cleo spend in the basement ? did he/she have any human interaction ? If she was left alone without human love & interaction then there is going to be a huge amount of psychological damage to Cleo.Jumping from his perch may well be a cry for attention,I would suggest you find an animal behaviourist to help you in rehabilitating Cleo.It will be along & slow road but I'm sure you are aware of that,good for you for taking this poor grey from what sounds a miserable existence, I only wish i could offer more advice,but im in no way experienced in this kind of neglect/behavior field.