Does this sound familiar? My sophomore year of high school, I was tired all the time. I would describe myself as sluggish, just constantly tired and moping. I was a swimmer, and I could feel myself getting exhausted faster. My body felt weaker than it ever had. I was also experiencing really bad headaches. I was prescribed medicine for them, but it didn’t help much. My doctor thought maybe it was a vision problem, so I had my eyes checked and got eyeglasses. But they didn’t really help that much either. I also felt super anxious. To sum it up, I felt terrible most of the time.