Dude I have been through the exact same process you are describing and it all started when I was around 16 ..from the Er visits and the constipation and the being scared but your best bet is too stay away from googling these symptoms it will literally scare you into a deep depression (trust me I am still coping with these same symptoms and I am 23 now the best thing for you to do is change the way you eat and think that helps me to deal with it better
I wouldn't be taking psyllium or anything else until I knew what was going on. Nor can we tell if what you're describing is what's happening or what you think is happening. You've seen a lot of doctors, but oddly, it seems they're all at the ER and not your regular doc. Psyllium can be useful. A blend of fibers is better. Metamucil is not healthy because it has added ingredients you don't want. Beans, especially soy, might be a problem, as you might have a food allergy or a problem digesting beans unless they're properly prepared. Some people do great on them, some don't (my wife doesn't handle some well at all). And when you're gastric system is stressed, things that normally wouldn't bother you might. It's also true that gastric problems are one of the most common results of anxiety, but that doesn't mean anxiety always causes them -- usually it's a person's diet that causes them due to digestive issues that medication doesn't address. Look, if I had a magic wand, I agree, you should see a gastroenterologist and a holistic nutritionist, but I don't have one. But consider that treating digestive issues isn't one of allopathic medicine's strong points. Everything they give you is suppressive or softens things up, which doesn't deal with or even look for the cause of the problem and drugs such as Xantac can make you feel better temporarily by suppressing acid but given we all need stomach acid to digest minerals and protein, the stomach will just adjust and produce even more. You need to get a good and accurate diagnosis and stop trying to diagnose yourself, you need to start relying on your own doctors and not the ER, and probably need to learn a lot about diet, which is why I recommend a holistic nutritionist. You're not going to get a medical opinion on this forum, because none of us have those credentials -- we're just anxiety sufferers. You're in a pickle, and we're here to help and listen, but you do need to find out if you have a genuine physiological problem or an anxiety problem. Given how often your parents have taken you to the ER, I find it hard to believe they won't take you to the proper regular doctors and health professionals you can form a relationship with, which you can't do at the ER. It's hard to see how eating more than you should have would produce more than a stomach ache, especially at your age. The extreme emotional reaction you've had to this suggests an emotional aspect, but again, we're not experts. But fiber such as psyllium, for example, causes gas, so you don't take it if gas is the problem -- you take it for a short period of time for a temporary constipation problem or regularly in blends if you have a permanent problem. And as for not having access to it, you can get psyllium anywhere, even in a drugstore, but at any health foods store.
" I read that if I indeed have a hiatal hernia and it is a certain type, my stomach can get strangled ..."
Googling for symptoms and cures will always lead to anxiety. because there are so many ways you can die that you will surely find someone who did just that in your same situation. People have died because of a clot from a thumbtack in their hand that formed the clot that traveled to the brain.- how do you guard against that, wear steel gloves in the kitchen?
It is scary to have gastric issues that cause pain, so try to get rid of them following the instructions they gave you. The best fiber is from psyllium, but in powder form it tastes awful so you have to mix it with a sweetener. I like it in soy milk shaken hard with no sweetener (although even plain soy milk has some in it) so it blends in, but most take it as Metamucil which has some sugary flavor which takes awful to me. Anyway, psyllium is better than any other kind of fiber as you will find after a day or so. Fiber makes bowel movements because it is indigestible, so don't overdue it and the fiber might make your stomach work hard too so you won't eat as much during the time it is in the stomach.