Seeking expert counseling is a sign of strength. A personal relationship with a caring professional is proven clinically effective.
I believe that I can help.
I do think that it would be wise to make an appointment with a psychiatrist. Reading over carefully what you have written, I believe that it is not ADHD from which you are suffering, but bipolar
Bipolar disorder can be an an outcome of TBI and some of your symptoms are consistent with bipolar disorder (lack of focus, speeded up psychomotor reactions, high libido, reckless spending, and excessive and rapid talking - the kind that sometimes get you into trouble). Bipolar disorder can also make you feel down, and this can be relieved by the amphetamine and dextramphetamine in the Adderall.
Sometimes a person with Bipolar Affective Disorder (BAPD) is misdiagnosed as having ADHD and is given Adderall which creates euphoria and confidence by stimulating the reward centers. Someone with can feel better in the short run by taking Adderall which temporarily boosts confidence and makes you feel happy, but which can lead to addiction and dependency.
While the euphoric feeling of taking amphetamines is similar to those feelings in the manic stages of BAPD, if can make you anxious and distort your ability to perform with clear thinking and organized mind.
If you cannot get to a psychiatrist, talk to your local doctor and tell him your symptoms and see if he thinks it is ADHD or Bipolar, and if he is willing to give you Adderall, or something else.
Adderall is sometimes used as an adjunct for depression, and if this helps you with your depression or keeps you in a steady state, then the doctor may wish to prescribe it for you. Because it is a controlled and sought after substance, you are more likely to get relief from a psychiatrist if he or she finds it appropriate.
You have lots to consider, but seeking a professional, face-to-face assessment is the only way to go.
I wish you great success.
Elliott, MAE, LPCC, NCC, CCMHC