For the next 24 hours, my mind was extremely cloudy and it felt as if I was in a constant state of "drunkeness" with an inability to think lucidly - to be honest, I had never felt sick like this before in my life. Making things worse, that night on the train ride back from Macchu Pichu, I was so mentally foggy that after boarding the train and handing over my ticket, I could not successfully find my seat (I know, it shouldn't be that hard, but I was THAT out of sorts)...what I thought was my seat was occupied by someone else with a valid ticket and after that, it just became a mess to get settled - I could no longer find my ticket, the staff couldn't find it and the train was ready to depart...by then I got the feeling that everyone was looking at me waiting for me to find a seat, possibly thinking I was a bit crazy, drunk, on drugs or something else. At that moment (with all my friends in a different train car unaware of my current predicament), I was a bit worried that I might even be forced off the train to fend for myself to catch another a ride, a significant concern based on my current mental state. Thankfully, I think with the crew possibly seeing the panic in my eyes and having just as much trouble identifying my seat, they sat me in an open seat in first class. When the train arrived to its destination, I shared my predicament with my friends, who in turn, ensured I made back to our hotel safely, as it was late at night to boot.