Well it sounds like you already have a positive test result so I wouldn’t go any further. Dr. Mcoombs feels that anyone who ever has done antibiotics can have a gut flora imbalance…so if you combine your test results with prior antibiotic use…I think thats a good enough diagnosis right there.
I would go to a naturopathic or GI doctor for a potentially good treatment plan but I am unsure what other testing your would need to do. Actually, I would consider getting tested for h.pylori and parasites if possible…typically people who have candida overgrowth also have parasites. We all have them just at different levels.
I can’t really answer questions 2 and 3…