NEWTON, Iowa (AP) — To the outside world, NASCAR driver Matt Tifft was simply dealing with back pain to start last season. When Tifft was alone, a series of painful and increasingly bizarre symptoms stemming from his brain had started to worry him a lot more than a bulging disk. Tifft, an Xfinity series rookie in 2016, was suddenly extremely sensitive to light and besieged by pounding headaches.Read more on NewsOK.com