Erection problems

I am 21 and suffer from the symptoms of sexual exaustion . I was thinking of taking 5 grams of L-Argenine a day along with craniYums to boost my seratonin and dopamine levels back up. Either that or mucca bean extract for the dopamine. I was also wondering how these products work, if they work by inhibiting the reuptake of the neurotransmitters and are they advisable? or should i wait for these to replenish naturarly? if so how long should it take for them to replenish? I also suffer from constant hands and feet and have been taking various natural remadies but to no avail. Also is there a way to increase Acetycoline or will it replenish naturaly as well. Any help much appreciated. I usually drink quite heavily on weekends and get very little exercise. i smoke also but only on weekends and masterbate on average about 14 times a week.