are you sure you are overproducing acid?
No. The only thing I'm sure of in this respect is that I have become totally confused by what many other people have said the whole stomach acid, stomach PH thing is supposed to be about, or not be about, inside a healthy human. At this point, if I should try once again to delve into the stomach/acid/alkaline maze so as to actually better undersand and grasp the pertnet and underlying principles..... and all the attendant "should it be acid?".... "should it be alkaline?".... "does it vary?"...."do I need to flip a coin?" that seems to come with the present and GLOOOOOOOOORIOUS body of public knowledge that permeates on what good stomach health is supposed to be, or not be, my head is either going to succomb to dizzyness OR my stomach may in fact lose it's contents, in an upwardly projecting fashion, one in which may leave me to say "well, I don't know if this mess is mostly alkaline, or mostly acidic, nor do I know which of the two a healthy stomach should be producing, neither do I know what?, on a good day, which of those those two this mess should be made of, but I DO believe beyond doubt this mess is in fact vomit nonetheless". 
were you diagnosed with a hiatal hernia?
Yes. Twenty years ago nearly to the day. After various bouts of complaining of this, that, the other, the then "my doctor" sent me to a local hospital lab, where a "the nurse" instructed me to drink a cup full of stuff without giving me any other advice or helpful warning that would allow me to expect what was about to happen; I drank the cup full of stuff and within moments I thought I was about to die from asphyxiation..... stomach / esophogus feeling as though about to explode, during which I found it quite difficult to breath, which caused cute nurse to say "oh, you are supposed to experience that reaction, it helps to inflate your innards so mr official radiologist guy can inspect your innards". Then she pushed me towards the room where mr official radiologist guy sat behind some bizarre looking television equipment setup. mr official radiologist guy sitting behind bizarre electro gadgetry setup was probably the most arrogant sob disguised as helpful public servant doctor guy that I have ever had the displeasure of meeting in my now 48 year old life. He instructed me to sit in front of his bizarre apparatus and funky tv gadgetry, whereupon I could see live, albeit cartoon-like, my very own living/working innards, in a live X-ray view kind of way. Being a curious fellow, I then asked him questions about what his fancy gadgetry was displaying, which he thoroughly ignorred while harrumphing and grumping away at the controls of said gadgetry. He continued to bark instructions, like "take in a breath!"... "now hold it!!"..... "now swallow!", for about 10 minutes, during which he otherwise ignorred my existance. He then got up and briskly walked out of the room saying nothing to me. cute nurse lady came and pulled me out of room, stuffing a packet of papers in my hand while saying "yep, you have a hiatial hernia, this packet of papers is our advice, have a nice day"...... silly me, it would still require another 20 years of me gradually becoming cognizant through repeat experiences of such repeating insluts to realize the system of public servants I was living & working within had a tendency, from my view, to generally be about to being all that helpful to me. Along the way, I eventually learned that hiatial hernia in and of itself is a separate condition totaly removed from GERD, theoretically caused by all kinds of things (like, coughing), but a condition that just so happens has been seen to frequently exacerbate people who also experience gerd.... so I got that goin for me :)