Hi! I am happy that thiamine supplementation works for you. I would like to share my thoughts about coffee. I love coffee's taste and aroma. Unfortunately after drinking 1 cup ma hands shaking and I feel strong anxiety, my stammering suddenly turns much worse. I also tried thiamine supplementation for about a month, but without any noticeable effect, your story gave me some idea. I replaced coffee by tea, around 10 cups by day, maybe there was problem, maybe tea was blocking absorption of thiamine? I will give another try for thiamine with support of magnesiumm but without tea, only water.