Here's a little information for everyone about SIBO (also known as Blind Loop Syndrome in some literature)
You Tube Video by Organic Olivia explains about SIBO in detail.....although I am not suggesting you buy any of the products she mentions necessarily. She refers to Acne but it is the same principle to work at making your gut health better, eliminating bad bacteria & increasing friendly bacteria.
Please know most of these Probiotic drinks in the supermarket do not deliver enough friendly bacteria - so don't waste your money here I am currently taking L-Lyscine (amino acid) as explained in the Video as £9 (relatively affordable) - it has improved my hair (used to fall out), nails (used to break, have ridges, weak) and skin. I have found that a product in Holland & Barrett called Yeast Raiders (£25 a month so not cheap!) is helpful after the above to keep the stomach stable and yeast growth at bay.
Doctors can test the Microbiome as in the 'Doctor in the House' program, however if you cannot get the DR to agree (as often you can't) - some people believe in the spit test (sounds disgusting I know!!) Google the spit test for more information - however do remember most people say it is isn't 100% reliable.
Also, you might like to check out SIBO/Candida diets and Dr Michael Moseley Gut Diet Plan ..... our brain & gut are linked in relation to Neurotransmitters (which in Fibromyalgia can be elevated or considerably low). Therefore, looking to help you gut health should help the neurotransmitters reducing symptoms and fingers crossed help sleep too. Plus Colonic Irrigation may help but again usually around £45-50 per session.
I hope this helps explain all about this and you find it interesting, I have mentioned lifestyle changes can help but we need to come together to lobby for research
Keep fighting guys - please know that you are likely to get worse before feeling any benefits from improving your gut health as many experience a Herxheimer Reaction