Hi there - I just had my second NA on my left hand. The first one was about 3 years ago, and whilst not pleasant, I could cope with it.
This time - excruciating pain from the injection of the numbing sedative! I was actually screaming....
Yes - it did the trick in about a minute, but I was left shaking and totally upset by the whole experience - and this is a doctor I have been to ..
Now it's 2 days on - and my hand locks a right mess - plenty of needle holes - yes, I expected that - but to have a hand where severe bruising stretches to my wrist and down the side of the hand....my hand is extremely swollen and painful.
I cannot flex my fingers due to the degree of discomfort.
Certainly nothing like the first treatment I had....
This experience has been so bad that I cannot ever see me going back for another one.
This was an experienced doctor in Toulouse, France, but he always left me to decide when I needed the procedure doing - and to phone him - no check-ups at all... in fact this time I had to go privately, as the earliest appointment I could get, wasn't until late October!
As an ex pat from UK, permanently living in France, it was relatively easy to find a Dupuytren practitioner, courtesy of this site...but now to find another one???
I cannot tell you how upset I feel.....

The only painful part of NA for me was the injecting of the anesthetic. I've also had cortisone injections in the hand and that was five times as painful. Strong pain in not generally associated with NA. I would take Seph's advice and find someone else. Something is wrong there.