Thanks for your query.Based on the facts that yo have reversed your vasectomy
and trying for baby,Your problem of erectile dysfunction
are most likely mind related and due to anxiety.Following measure will help you to boost up your confidence and getting good erection.
1) Practice regular exercise fior 45 minutes followed by meditation
for 1/2 an hour in the morning.
2) Take high protein diet rich in vegetables and fruits and vit A,C,D,E.
3)Take anti oxidants like Almonds 5-6 everyday..
4) Avoid alcohol and smoking..
Please consult qualified infertility
specialist for help to have a baby,