I think you must be consulting a rheumatologist. Crohn's disease and fibromyalgia can be handled by the same medications, what we term as disease modifying anti-rheumatic drugs (DMARDs). Since quinine is not effective, changing to sulfasalazine or other immuno modulators would be the choice. Mild physical therapy has definite role in fibromyalgia. Exercises or physical therapy does not have direct role in diverticulosis or diverticulitis. But good activity do help in every disease process.
For all those patients, who have insomnia, they need to change the sedatives in a cyclical fashion. This has an advantage of developing tolerance and habit forming to it. So getting an alternative prescription and stopping flurazepam can be considered by your physician with you feedback.
Gabapentin or pregabalin are the other medications which would be beneficial in your case, for control of pain of fibromyalgia, diverticulitis and Crohn's.
In the natural measures dietary modification is the best. Following can be tried;
1) High fiber diet
2) Low fat
3) Increased water intake
4) Avoiding nuts, seeds, corn, popcorn
Please feel free for your follow up questions.