Gastroenterologist specialist

I have a long term stomach issue related to GERD and long term PPI (Omeprazole) use and I’d like to see a specialist about it however struggling to find a good one. I’ve been going to BNH and BCH which are okay in prescribing drugs to mitigate but aren’t interested in addressing the root cause. Any recommends for a good gastrointestinal doctor or department?

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