Around 2014 I found myself regularly coming down with classic flu symptoms. A raised temperature, sore throat, aching limbs, heavy fatigue, and sore lymph nodes in my underarms and groin would wipe me out for one to two weeks at a time. These periods of illness would often fall when I had a lot going on, so I wrote them off as stress, a poor immune system, or the knock-on effects of my blood sugar condition, reactive hypoglycemia.