no effects T to stimulants. modafinil works wonders for me (stay away from aurobindo generic maker). the key is to take it 2-3x a week otherwise your tolerance will shoot up.
amphetamine type stimulants will cause serious mental s/x long term.
you need to sleep / eat well, work out etc....then stimulants can work properly, can't make up for it
depression is usually psychosomatic in nature, not physical