Ah, no I haven't.
I've had a blood test done, which I don't think was connected to underactive thyroid.
Interesting though.
I do have an interesting book called 'rewiring tinnitus; it's by an american gentleman who has meniere's disease and he approached his very intrusive tinnitus by meditating on his tinnitus. His basis was that our brains' view any sudden and intrusive noises as being dangerous and so focuses on them.
By focusing on the noise of the tinnitus through meditation, your brain starts view the noise as no threat and eventually loses interest in the noise; a bit like air conditioning unit when it's on, or a clock ticking in our living room.
I do take amitrypline 20mg and find that really helps as well.
xxx