I had severe reflux some time ago. Started one night when I was camping - head not so high as I slept - when I woke, unable to breathe because of inhalation of stomach acid/vomit, gasping, choking. Frightened me (and partner) almost to death.
Happened again and again. Scary. Eventually, yes PPIs and a bed I could tilt upwards (like a hospital bed), managed it. (And I stopped camping.) In hotels, I'd get three or four pillows, likewise staying with friends or family. This reduced the frequency of waking with reflux ... and I'd wake, when it did happen, a moment before inhaling the stomach juices; often I could vomit rather than choke. Still horrible, though.
Then I more-or-less decided I'd had enough. Lost a lot of weight (around twenty kilos or so), stopped drinking alcohol, ate nothing after 3pm ... This was all hard; really difficult to do; but I hated so much that sensation of waking in the night choking, unable to breathe, gasping or vomiting acid and so on.
Now I'm much, much better. I sleep flat with just one pillow, very occasionally get a bit of heartburn, but off the PPI drugs, and occasionally I allow myself - with some trepidation - a meal in the evening and even an occasional glass of wine. (I still have the tilting bed, and use it for such occasions; so far it's worked.) Occasionally, particularly when stressed, I get that knot in my oesophagus and am unable to swallow properly ... so far I can manage to sip water and relax it enough and it goes away.
I reckon, after some experiments (been a long time, all this) that what makes the most difference is my weight. I am still overweight, but not so morbidly obese as I was. If I relax, persistently overeat and put on a few pounds, I can feel the reflux coming back.
So, good motivation for losing weight, which has helped my overall health no end. (Thanks, acid reflux!? ... Well, perhaps not that much.)
I know this is just me, but I offer it as a potential light at the end of the tunnel - this was horrible, but now, after a long long struggle, many years, I do feel much better. It's been over a year now since I was woken in the early hours trying to cough stomach acid from my windpipe. And I eat more healthily and drink less booze; all round a more healthy lifestyle.
Good luck everyone!