I also quit Riluzole after six week trial. It didn’t slow my progression at all, plus caused me to be fatigued all the time. I could just eat a meal and be wiped out and have to rest for an hour.
Two days after stopping the Riluzole I was back to normal on energy level.
As far as supplements,(I have tried many) the only one that I know for sure helps me is Curcumin with black pepper extract.
I also take vitamins B,C,D3,E plus CoQ10.
I know that if I’m delivered from this it will be by prayer and God’s grace.