How should you go about getting assessed and treated for adhd, social anxiety and depression?

See a psychiatrist: Psychiatrists are trained to sort those out. People often diagnose themselves incorrectly with those diagnoses.

okay...: Thank you for this question as taking the first step can be the most difficult. Bring up your concerns with your primary care provider as you may be more comfortable talking with him/her and they can refer you to a therapist or psychiatrist they are comfortable with. Many psychiatrists and therapist will take self referals directly as well. Best wishes to you.