on this forum there was a post from a person who found h2s sibo. and he was completely feeling healthy on a sulfur-free diet (which is very similar to a histamine-free diet).
So, a low sulfur diet greatly helps the intestines with h2s sibo, but the most basic thing that is also prescribed is pepto bismol(and it helps). You can stick with it for a week and tell the result for the sake of experiment. That guy, by the way, had no sibo symptoms other than flatulence.