Why did the local anaesthetic used in my wisdom teeth extraction not fully work?

I had my two lower wisdom teeth removed around 36 hours ago. The extraction was extremely painful even though the surgeon injected me with a local anaesthetic three times on each side. I have to go in on a weeks time to remove the upper two and I am very scared. When the bottom two were removed I kept telling, and eventually screamed at the surgeon that I was in extreme pain even though my lips and tongue were numb. Will I have to ask for something stronger, or is something wrong with me?

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