I am diagnosed with helicobacter and (since today) SIBO as well, though not to that big amount.
I would get tested for helicobacter asap, just in case (those bugs let everyone in, including SIBO).
The next step is SCD diet. The diet was designed to change the gut flora from top to bottom on the long run. It has helped people with crohns, SIBO, IBS, Ulcers (me), colitis, autism, CFS etc.
Look up my very restrictive version in the diet section. I have also posted some recipe ideas. It will be hard, and you need to find your own version of it, but it is so worth it!
I was in pain from that stupid ulcer for 2 years, everyday (also had parasites and whatnot), and I have just restarted the SCD diet a one and a half weeks ago, this time more restrictive. Today is the 4th day without pain.
I know it sounds crazy, and I would not believe myself. But under the circumstances we are in, this is the last straw, and it works. It needs work, and patience, and it will be ups and downs, but give it a try for 30 days. You have nothing to loose at this point.
I also started my own page named edible health, where I will try to post at least once a week. The recipes are things that I have tried, the pics are mine.
Good luck, and write me if you have second thoughts, questions or motivational troubles, are in need of a recipe or just whatever.
BTW, SCD is not my invention, that was a lady named Elaine Gottschall in the early 50s. There are some really great pages out there for more info, especially my dear crazy boys Jordan and Ryan from scd lifestyle. They make awesome podcasts. Their book is more for boys who never cooked before, but very easy to understand.