I started to feel some past problems in e.g. neck area from some botched gym exercises, inside head where I had often sinusitis problems, some left leg issues etc. They seemed to escalate quite a bit, to the point of pain, I was on the verge of breaking the fast but I kept going, then on day 7 all those symptoms disappeared and I haven't experienced them since my last long fast. Not sure if they were of physical or neural (memory?) origin.
Actually, this is quite cool, after 5 days of fasting human growth hormone jumps to 10-20x normal level and that corresponds to me feeling miserable on the 6th day, then again great on 7th. It's now starting to make sense why some physical injuries were felt and then disappeared.
