Two days ago I went out with some friends for a few rounds of drinks. We had a good time. Nothing extravagant. The next morning I woke up utterly destroyed. I did NOT work that hard to feel that awful. I only had a few beers, not the entirety of the pub. Most worrying is the back pain I feel in my lower left kidney region... It was a constant ache yesterday, and today has subsided into a dull throb, with only a few spikes. Anyone else ever experience this? And if so, how did you fix yourself?? This is awful.