Why Does my Upper Jaw (Maxilla) Feel Weird?

when i slipped and feel bottom first onto my lower jaw (mandible) onto a hard wooden table. Why would my upper jaw (maxilla) feel uncomfortable, if its my lower jaw (mandible) is what i hit. i mean my upper jaw (maxilla) feels very uncomfortable and weird, but not painful. on the other hand, my lower jaw (mandible) feels very painful and swollen. this injury by the way happened about 11 months ago, and i already had got a xray of the facial bones 10 months ago, and my doctor says it came back fine.

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