Like others said, ETD can heal and the spike can settle down after ETD is over. Have you got some antibiotics for the ETD? One thing for sure is that stress and anxiety can aggravate T, so try your very best to stay calm and positive that the ETD induced spike will be over soon. Try to float some positive vision of better days ahead. T feeds on our bad emotions so try not to provide fuel for it to continue the tyranny.
Have you tried some of the high pitch nature sounds, such as shower, waterfall, cicadas, heavy rain, or even squeaky faucet sound? The objective of masking is not necessarily to over power T and cover it entirely. It is to provide other more soothing sounds so the auditory system can focus on them and distract the brain from zeroing on T. In fact we need to set the masking to slightly below the T so that we can train the brain to slowly get used to that ringing over time. Don't panic and don't despair. Give it some time. Try to take some meds or natural alternatives such as lemon balm, hops, valerian, chamomile etc. to calm your nerve and perhaps try melatonin to help sleep. Take good care. God bless.