Regarding the LPR, here is a 2008 document from the National Institute of Health claiming that several studies debunked the use of PPIs (Nexium, Prilosec, etc) being effective to treat LPR. They are effective for GERD and other reflux symptoms, but not LPR. They showed that placebo and PPI medicines were “curing” LPR at approximately the same rate.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2503658/

This paper in 2017 claimed that a “plant based diet” and Alkaline water were more effective in treating LPR than the PPIs: https://www.ncbi.nlm.nih.gov/pubmed/28880991 (abstract only)

Yet you go to the Ear Nose and Throat doctor, and he will put you on Nexium when LPR symptoms seem to be presenting.

In reality, little progress has been made in LPR treatment since that 2008 NIH paper above, and it's still likely being treated incorrectly. It has also been poorly studied in general, and there are websites all over the place from years-long, frustrated LPR sufferers who insist that nothing they do can solve the problem.

For certain conditions, going to the doctor and following the doctor's advice to the letter (and taking all prescribed medication) is a must.

For other conditions like LPR, you're getting a lot of guesswork from your doctor (even a specialist), and very likely a treatment plan proven 10+ years ago not to be effective.