Can bloating damage umbilical hernia surgery 2 1/2 weeks post op?

2 1/2 weeks post op (open repair, small umbilical hernia, no mesh) I drink about 8-9 beers rather quickly at a friends birthday. I was only standing and talking casually but would that volume of beer be enough to stretch my surgery to the point of causing damage or tearing? I felt a few mild sharp pains that night and nothing else. Also I have a hard lump that I can still only feel under the skin where my surgery was, is this normal?

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