Severe Acid Reflux

My daughter is 5 weeks old. She has really bad acid reflux. We've went to the doctor several times to try to get her on medicine but she hasn't been put on it yet. Today, her doctor said to add rice cereal to her bottle to thicken her formula and make the acid in her stomach stay down. Is 5 weeks too young or should I just keep doing it? It seems to be helping a little but I'm worried her stomach can't process it. HELP 😩