I really doesn't sound like the beer did this...... since you drank after the fact & you didn't die. The possibilities of that single beer being poison are astronomical.
Have you discussed this with your pastor? Have you given it any thought that it might be a spiritual matter?
Luke 13:10-13 10 And he was teaching in one of the synagogues on the sabbath. 11 And, behold, there was a woman which had a spirit of infirmity eighteen years, and was bowed together, and could in no wise lift up herself. 12 And when Jesus saw her, he called her to him, and said unto her, Woman, thou art loosed from thine infirmity. 13 And he laid his hands on her: and immediately she was made straight, and glorified God.
Luke 13:11 (NASB) And there was a woman who for eighteen years had had a sickness caused by a spirit; and she was bent double, and could not straighten up at all.
If your pastor doesn't believe in the gifts of the Holy Spirit, find one that does.