For those with unilateral tinnitus that seems influenced by neck stretches or TMJ issues, try sleeping on your back or on the opposite side to avoid pressure on the affected ear.
Also, consider getting an MRI to check for possible causes; in my case, a vascular loop was found contacting the vestibulocochlear nerve inside the internal auditory canal.
While I consider my case largely managed, it still flares up a few times per month, usually triggered by irritation or inflammation (allergens, getting sick, poor neck posture, loud music for hours)
Percussion massage gun with the sharp tip, aimed at the trapezius and levator scapulae. Those muscles can refer tension right around the ears. Targeting them can calm things down fast, especially if your tinnitus is posture or tension-related.
Not medical advice.