Sexual dysfunction & premature ejalucati

My age is 40. currently i am having less. eraction when trying to have sex . sometimes nt able to get eraction at all. very embracing situation. i m married for last 11 yeras. we are having great sex before our mrg. after mrg and with our kid sex has became boring . now when i am trying to have sex nt geeting enough eraction sometimes it's zero. in betwwen i tried manforce 50 & after dt manforce 100. sometimes it works sometimes not. i don't hv diabetic or hypertenison. I don't hv any bad habits. I don't smoke & I drink once in 6 months. I had consulted in practo & dr ajay gupta has advised me to take nano leo capsules twice daily after food & to tab duroplus twice a week 30 mins before sex & go for sex after two hours. I am taking these pills for last 25 days . Duroplus I had only taken twice .. My problem is previously my eraction is less but whn eracted used to last long . now I am getting eraction immediately & it's hard eraction but nt able to maintain it . losses eraction in