Couples years back I had a bad car accident, my left side back (from neck all the way down to the left chest) was hurt no matter what physio I had visited... It fatigued every time when it came to rain (not even what muscle relaxer or alcohols)...
Two years ago I went for a dinner with my sister in a Sichuan resturant. I ate all the chilli peppers (指天椒) in the big bowl (200+ at least, I ate all just because I don't like to waste). After that my eyesight got bury for almost 2 days (Later I figured out because my blood pressure was getting very low, my heart beat was fast and light, my pupil just kept extracting) and I got pooing blood for almost one week, my back pain got clue right after...