Thanks for your query,based on the facts that you have posted it appears that you are known hypertensive and facing problem of Erectile Dysfunction
As your Blood pressure is well controlled and do not have any major health issue the cause of ED seems to be mind related and due to performance anxiety.
Following measure will help you to boost up your confidence and getting good erection.and delay ejaculation.
1) Practice regular exercise for 45 minutes followed by meditation
for 1/2 an hour in the morning.
2) Take high protein diet rich in vegetables and fruits and Vitamin A
3)Take anti oxidants like Almonds 5-6 everyday..
4) Avoid alcohol and smoking..
( Viagra ) as on demand .Consult your family physician for prescription and advice regarding dosage and timing of the drug to be taken .
This should help to get good hard sustainable erection to have enjoyable sex failing which you may need to consult Urologist
for detail clinical assessment and investigations to find out the cause of your ED.