From the 61 in your nickname and the age at which you had a vasectomy, you may have been sat across from me in the same waiting room at Marie Stopes, Ealing .
It sounds to me as though you were psychologically affected by being vasectomised. I think there's virtually no evidence for it to affect a man physically unless there'd been a bad surgical mistake? Those reasons may be to do with why you had it done, whether you felt coerced by a partner, or did you feel in some way emasculated? I'm really sorry to hear this.
There's no effect on testosterone levels or anything like that, it's purely disconnecting the balls from the sperm delivery tubes (the vas deferens). The only physical effect really is that it can reduce the ejaculatory load by around 10% or so.
But it's good that Viagra has saved your bacon so to speak, or in this case, your pork .
I had my vasectomy quite young aged 30.
I'd accompanied my wife to the doctors to provide moral support, as we'd decided that we didn't want any more children and she wanted to enquire about tubal ligation.
I emerged from the surgery 20 minutes later having been persuaded by the doctor that vasectomy was a better option and easier to perform.
I found that erections and enjoyment were improved, possibly because of the removal of anxiety about unwanted pregnancies.
On the subject of possible psychological problems, I remember a friend who had a vasectomy and later on decided to become a catholic so he could attend mass with his wife and family. He apparently had to have various discussions with the old parish priest, and was quite anxious about the churches teaching on contraception.
Even though he'd had the vasectomy years before out of consideration for his wife who had experienced difficult pregnancies and a series of miscarriages, it was suggested to him that he had sinned and needed to go to confessions.
That had quite a big psychological impact on his erections and performance at the time.
(Don't want to start big religious debate...just giving an example)
It's about 50 years since I had the snip, and never had any problems except for coming across some reports years ago about a possible link to cardiovascular disease.
As I've been diagnosed with peripheral arterial disease, it does make me wonder.