Health - Getting an ADD prescription

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SWIM's pet hamburger has tried to no avail to procure an add prescription. He has tried several doctors and has recited each symptom of add he experiences. He is sure he is an undiagnosed case, as he has used speed and illegally purchased add meds to study on several occasions, which always helps boost his productivity and has overall increased his work quality and work load. He is just wondering, what would the chances of getting a prescription be if he just went ahead and told a psychiatrist this? That he has used speed to help him concentrate, is not at all addicted or dependent and that it has helped him improve his work and work load when used once off . Would the psychiatrist just see him as drug hungry or actually believe him?

Thanks.