Could my odd dizziness be from NMN? Anyone else who takes it longterm?

Been taking for over a solid year now. 250mg daily but upped my dose to 375 past 3 months or so (i take 3 capsules) and everything was great until October when I started experiencing this sensation that I can only describe as a feeling of " walking on a boat" when walking around. I've now been to 4 basic (primary/general doctors) who have performed basic exams (follow finger, push against hand etc) and they think I'm neurologically okay. The supervising Doctor at the ER also said the same thing. The issue still persists. It's not constant but very much present everyday. I just read about "neuronal degeneration" which terrified me. I'm not saying that my issues are a result of taking NMN I'm just wanting to see responses from other longterm NMN users and whether anyone has experienced similar. And I'm really hoping I don't have to stop NMN.