Dnt worry it happens sometimes. . Take  proper rest...healthy diet...exeecise....yoga... Tk tb manmath ras....cp shilajit  n ashwgandha tb ...1 each  mor n eve wd milk fr 3 months

Without detailed investigation it is impossible find the exact cause. However, based on your history, it could be psychogenic, which is also the most common reason for ED. Visit a sexologist or psychiatrist for further evaluation. Other self observatory clues can be obtained from nocturnal tumescence and sensate focus response. Take care.