It definitely sucks to have unpredictable T. Mine also fluctuates depending on change in sleep routine (circadian rhythm), diet & stress. There's a paper that focuses on two of these things & might be related to your specific issue: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5539131/
''Results revealed a time-of-day-dependence of tinnitus. In particular, tinnitus was perceived as louder and more distressing during the night and early morning hours (from 12 a.m. to 8 a.m.) ''
'than during the upcoming day. Since previous studies suggested that stress (and stress-associated hormones) show a circadian rhythm and this might influence the time-of-day-dependence of tinnitus, we evaluated whether the described results change when statistically controlling for subjectively reported stress-levels''
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