as u have high sugar and pressure ,erection problem in this age is common and can not be avoided.
u can do regular exercise like swimming ,walking etc
eat healthy diet and avoid oily and spicy food.
u need to take tab like sliga or viagra
to erect penis and make it hard.
if it taken in normal dose then it is safe to take.
so dont worry ,by doing exercise and diet control u can able to enjoy normal sex with minimum use of drug.