I had a small epiphany recently. I had a misfire injection. In a bit of a hurry and seemed like a dull needle. I guess it did not penetrate the cavernosa even though the 5/16" needle was buried to the hilt, as after injection, it just popped back. So I got the injection subcutaneously which causes grief and no erection. It caused a big red angry swell on the front right. After 3 1/2 years this was the 2nd such misfire.
The epiphany: I soaked the member in a cup of ice water several times a day fr 3 days to reduce swelling and tissue damage - - - it did not hurt. Icewater with ice.
I gather the junior member's nerves are clearly atrophying?? Years ago surfing in 50's water it was in pain and withdrew. Not now.
Waxing philosophical. First viagra use to failure for many years, and now Trimix/PGE working good and extending a great sex life.
Wife has never had it better. But we are getting older and doing things that some combination of nature and genetics did not intend for some. They say half jokingly that all men would die from prostate cancer if they lived long enough. Maybe likewise with Ed at bay, sooner or later we all get DE if we soldier on with our chemically fabricated boners. My wife's mother confided many years ago that their sex life faded in their late 50's due to his ED and he was a frustrated French horn-dog. He never even got a chance to get to the DE stage. We are. Of course it's in the genes and then exacerbated by all the other contributing factors mentioned above and by life's toxic chemicals and exposures no doubt. It's frustrating and it's getting harder to get off every month. I'd guess that most of us had a touch of youthful PE. Now it's the wife's turn. Karma.
Now I go do the cooking afterwards while she recovers. 
Role reversal. She says some of the best ever now so it's not all bad at all, just different. I exorcise the little devil later to keep the prostate clean. 