I know that GERD can cause issues with the eyes (pepsin in tears, dryness, redness, etc) and sinuses.
I developed GERD about 4 years ago and somewhere around that same time I bought an iPhone X and I couldn't look at it. I still can't. Not any iPhone, Samsung, or nearly any phone with PWM.
In my quest to figure this out I've realized that my PWM issues started around the same time as my first big GERD flare. I randomly decided to look at phones I used before GERD (Samsung S8, S9, Google Pixel 1, 2 for example) and the iPhone X and was surprised to see they had low PWM frequencies (around 240) but never caused any symptoms. Now I can't use most phones with 350+ PWM without dizziness/fogginess, headache, eye strain, etc.
I searched around and can't find anything about a possible connection online, so I wanted to post here as well as ask if any of you suffer with GERD/LPR or other stomach acid issues.
This all sprung up after my phone that usually is fine started bothering my eyes. It hit me that it started a few days after my current GERD flare began.