I had a bad bad case of SIBO. Extremely high levels of hydrogen in my breath test. This caused symptoms commonly labeled as fibromyalgia. 

Diet only did not work. (Low Fodmap)
Elemental diet didn’t work. 
2 rounds of antibiotics (two different kinds, first one was hardcore) with no lactose super low carbs diet followed by probiotics to rebalance the flora. 

It’s not fixed yet. But so much better. I’ll need to repeat probiotics at least once this year and another time next year. 

We’ll see at next doc appointment…