Erectile - dysfunction is closely related to mental - problem and since you have observed this disorder since five years, it may be because of excess stress. A few tips mentioned below will alleviate your problems-
1) Take around 8- 10 pieces of Raisins and soak them in around 100 ml of water in a glass for overnight and in the morning consume the Raisins, which are in enlarged condition due to swelling and along with this, consume the remaining water. You may take a glass of warm water following this concoction. A regular use of Raisins as stated above in the morning for a period of two months will produce a positive result in the alleviation of your disorder. Raisins contain full of antioxidants such as Iron, Folic - acid, Magnesium, Niacin etc which will nourish your metabolism including your digestive system.
2) You may try Aswagandha of any reputed Pharmaceutical. Take a teaspoonful of this powder along with hot warm milk in the night after the dinner. A regular ingestion of this powder would suit your excited nerves and would produce certain sedative effects. The nutrition value of Aswagandha such as Calcium, Phosphorous, Magnesium etc will tone up the entire body - system giving you an extra stamina in all your activities. Consume the same in winter for at least forty days.
3) Avoid stress at all the cost.
4) Poor digestion may also affect your sexual - performance and so you may use Gooseberry - powder of any reputed pharmaceutical by taking one teaspoon powder twice daily after your meal. Gooseberry contains numerous valuable minerals such as Chromium, Iron, Magnesium and abundant amount of Vitamin B complex and these constituents will nourish your body including the surge of your sexual - urge.
5) You need to take rest for at least eight hours in the night since proper rest allows the different hormones such as endocrine, thyroid etc to work better for the maintainable of health. In that way, you will have excellent metabolism.
Don't be misguided by the fake advertisement appearing on the magazines and papers claiming the effective remedy of sexual - dysfunction. Such medicines may prove detrimental to your health.