Tinnitus and left ear pain lasting for three years could be due to underlying issues such as Eustachian tube dysfunction, TMJ disorders, or nerve-related causes. The recent worsening of your symptoms after starting Vazoprazan may be coincidental, but in rare cases, acid-reducing medications can affect nerve function or cause changes in
electrolytes, which might aggravate tinnitus.
Vitamin B12 deficiency is known to be associated with tinnitus in some individuals, especially those on long-term acid suppression therapy. Taking an over-the-counter Vitamin B12 supplement, such as methylcobalamin, is generally safe in recommended doses. However, it is advisable to get your B12 levels checked to confirm deficiency and guide proper dosage.
I recommend consulting an ENT specialist for a detailed evaluation, including a hearing test, and also discussing the possibility of medication-related effects with your gastroenterologist.