Talk to Sexologist on Zero Timing, Weak Erection

Respected doctor. 34 years old. married for the last 4.3 years with one daughter. timing problem from first day of marriage & erection problem for the last 08 months. have used the medicine for two months suggested by sexologist, clinic in Nowshera cantt Bazar. the problem was gone during medicine as the time went up to 10 to 14 mints but again came to zero after the medicine finished just like hakeemi medicine. no difference between the two schools of medicine. have tried both Hakeem and doctor for timing but now tired of them plz suggest me some thing for lifetime solution please. any guidance any medicine any direction ? my wife is now not satisfying as her timing increased with passage of time.. PS. zero timing means intercourse for merely 7-8 seconds or 3-4 pushes and discharge.