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I sympathize with Amy because I also have severe tinnitus on top of my gMG. I do not however think MG can have caused my tinnitus which began some years before any of my MG symptoms appeared.
My tinnitus has always varied with my level of tiredness. I suspect this is because my “mental filter” that my brain uses to screen out my tinnitus signal requires some mental effort that is harder to exert when I get tired. The extra tiredness I experience with MG may have worsened my awareness of the tinnitus, so I could say MG makes my tinnitus harder to tolerate. But I do believe it is mainly because I am now feeling more tired more often.