Hmmm... well, this may be a difficult Q to answer. It’s possible that drawing too much vacuum for too long could damage some blood vessels, not sure if that would cause loss of sensitivity, tho. The good news is, at least you can still reach orgasm w/ enough stimulation, but obviously if the sensitivity continues to decline, it’s possible it could reach a point where that type of stim wouldn’t do it. I think it’s time to see a Urologist about this - there could be other issues that are causing the loss of feeling. I have read that it’s fairly common for guys to lose some feeling due to age, but yours sounds a little more dramatic than that. Talk to the Dr & good luck with this, hope you find a solution...
Another Q: Do you think it was the use of the VED that caused you to lose sensitivity, or were you already losing some before trying it? I’ve heard that diabetic men suffer from neuropathy, which is a loss of nerve function, which can cause ED issues, but it wasn’t clear to me whether this also affects the sensitivity necessary for orgasm.
That's unfortunate. You were having erection issues before starting to use the device? What happens if you don't use it? Have you spoken to your doctor about erectile dysfunction? Is medication something that is an option for you instead of the ved?