Post Chemo Tinnitus

I had two 3-month rounds of chemo - FOLFOX - and it was during the adjuvant phase that I became aware of the sound of rushing water in my head. Chemo was completed more than two years ago, and most effects have faded but this noise has persisted. An MRI didn’t disclose a cause. It can be hard to cope with at times and any tips and advice would be very welcome.