Failed nerve block

After several highly successful nerve blocks on both sides of my head, the latest one on my right (worse) side didn’t take. I’m frustrated because I’ve been in pain more or less since September, when I woke in the middle of the night with a sudden flare up. During the procedure, I had quite a lot of bleeding and I wondered if this can contribute to the failure. Any other thoughts about why it might not have worked this time? Should I try to get another? I’m in another country at the moment for a couple of months so I’d have to start over with a new doctor, anesthetist, the whole rigamarole. Just thinking about it makes it hurt more.