I agree with the above poster. Also, the time after addiction sucks if you've fucked up your GABA system, that really makes life suck. Careful with benzos, they destroy a lot of people.
Your doctor might move you to a non-stimulant (or weaker stimulant, as the case may be) ADD med (assuming that's why you get the adderal) like Stratera and take you off Adderall completly. I think that'd probably be the first line of action since you're already on such low doses of adderall and you still can't sleep. I think most doctors would take you off the speed before putting you on benzos (that seems like the first logical responce, to continue ADD treatment with a diferent drug before getting you on something else). Then again, many doctors aren't very logical.