I have been taking Retigabine, as I would an Aspirin for a headache, i.e. when the tinnitus is worse I pop a 200 mg tab to calm it down.
This I have been doing for the last three years, and it's helped me habituate. I still have enough for a year to 16 months, but hope I will have totally habituated or found an alternative in the time I have left with this drug.
I have had no visual snow or bad side effects using it in this way. I find that the old stories about ignoring it are becoming true. It is very hard to imagine in your first 3-4 years of having tinnitus that you could ever ignore it, but you do eventually, it becomes less important on a weekly basis.
It was thanks to Danny Boy that I tried Trobalt/Retigabine, for me it has been very useful, if used carefully.