About 3 and a half weeks ago I suddenly got a high pitched tinnitus in my left ear. A week later I was having all sorts of physical and neurological symptoms. After a week of some of those symptoms have subsided but still some things are off. I've had an MRI which came back clear, but for some sinus fluid, and blood test came back with quite low vitamin D. Now, as of Monday this week my girlfriend also has tinnitus in her left ear just like I did. Currently that's her only symptom, but I find it strange that neither of us have ever had tinnitus before and now we both have it within a month. Any ideas as to what could have transpired?