My T varies a fair amount and seems to be completely independent of time, stress, types of food etc. In fact, I have struggled to understand a correlation with my tinnitus and any external and internal forces in my life. Perhaps only correlation is distraction when immersed in a project....but that may not change the actual volume of my T but rather my attention to it. No rhyme or reason....highly unpredictable. Surprises me when it goes low and surprises me when T volume level increases.