Attention and fatigue can be problematic with MS and if yours is caused by MS or even if MS is playing a part, even a small part, the meds may be ineffective. I would encourage you to speak with your neurologist. Amphetamine (adderall) is a stimulant which acts on your brain chemicals. Some MSers may be given Adderall, but its effectiveness, in my opinion, is limited to the MSer. That is, although the brain chemistry is affected, if the CNS pathways remain stifled due to scar tissue or from active lesions, the brain chemistry will do little to change anything because the nerves are the problem.
Your prescribing doctor needs to work with you to help you determine if Adderall is going to benefit you at all.
BTW, some of the greatest inventors and entrepreneurs have had ADD/ADHD. Who knows, you could be tomorrows billionaire inventor!