Hi,
Welcome to HCM.
I have read your description and understand your concern.
The problem you are having with erection is mainly due to old age and for the operation you have undergone related to
prostate and bladder, as it could have weakened
pelvic floor muscles.
You can try conservative means to overcome your problem by doing the following.
1. Kindly practice 'pause and squeeze' technique, which over a period of time helps you to sustain erection for a longer duration.
2. Take Tablet.
Tadalafil 30 minutes before intercourse to get good erection.
3. You need to overcome fear or
anxiety by doing
meditation regularly to keep your mind calm.
4. Include in your diet - almonds, banana, pineapple, saffron, cardamom, figs, honey and pumpkin, which would aid in getting better erection.
Once you regain your confidence, you should be able to gain good erection gradually and perform better. Later, you may decrease taking medications or take only when it is absolutely necessary.
Hope the information provided would be helpful.
All the best.