Hon,

Please be honest with them right up front. Being honest up front will be the best for all involved. They may take you off them and they may not. They may find something better for you out there and probably less addictive if you feel you are addicted to it. I am not sure how long you have been taking more than prescribed or if you get a high from it? Do you feel you need more just to fall asleep or does it do something else for you?
Please discuss this with them and please be open. I know how scary that is, but being honest up front will be in the best interest of you. Hopefully they can find something that can help with the depression and the sleep issues.
But this is just my opinion.
Please let me know how it goes.
Take care and good luck,
Jen