I got tinnitus from Amitriptyline. The serotonin in the drug is the culprit. Mine goes up and down too. Some days it is barely audible, most days it is hell.
You cannot reverse it. You are screwed like I am. The auditory part of your brain was damaged by the serotonin
Read this:
Increased Serotonin Levels Spiked by Antidepressants May Exacerbate Tinnitus
You got nabbed by antidepressant. The serotonin got you. I got screwed by amitriptyline. Read this:
Increased Serotonin Levels Spiked by Antidepressants May Exacerbate Tinnitus