I have eaten at a particular restaurant 4 times to date this year. The last 2 times, I have woken up nauseous in the middle of the night. The last time, I brought home half my dinner and ate it the next day for lunch with no ill effects. So my suspicion falls on the draft beers I drink there (2 per meal). I am meeting friends there are will order liquor instead.

Is this possibly a result of dirty lines? Or worse, cleaning products in the lines? Or some other cause? Should I make a complaint to the county health authorities and mention my suspicion? They seem pretty responsive and several places have been shut down in recent months due to “complaint inspections”.