MMMMKAY?, in answer to your question... Where to start is really, first and foremost that MDMA is a serotonergic neurotoxin and any ignorant dick that says otherwise I feel sorry for you, not to get into an argument that resposible use is safe blah blah blah majority of times resposible use never happens. Theres a ton of reason but obviously it is what MDMA does to your body/brain, both short and long term I mean literally where to start, what really got me to stop is the long term comedown that came after continuous rolling, but that really only opened ym eyes to the damage. If you would like to stop rolling, have a search around the ecstasy forum here and read some long term comedown posts alternatively.
70mg dexedrine a day is a solid amount assuming it is for ADHD... Yes ALA is something I would supplement with that personally.
As the poster above said, neurotransmitter depletion/receptor downregulation isn't neurotoxicity rather temporary as neurotransmitter stores are regenerated and receptors do reupregulate back to normal - neurotoxicity would be neuron destruction. I'm not really one for SSRIs after MDMA to block neurotoxicity, never done it but its better than nothing I guess. Keeping your doses responsible, taking safe measures ie staying cool, hydrated, and obviously antioxidant intake will help though!