losing weight rapidly ?

Short answer: yes. 

Long answer: It hasn't been exclusively due to GERD, however over the past 10 years, my reflux has accounted for the majority of my weight loss (80lb of it). My reflux started, hard, when I was about 290lbs. I'm now at 210.   

Recently (in the last few months), reflux has directly resulted in my losing 10 lbs. All in all, my major drops -- from 290 to 260, 260 to 220, and later 220 to 210 -- have been directly due to reflux not allowing me to eat, or fear of reflux, which leads me not to eat. 

And yeah, right flank pain seems to indicate gallbladder. Fun. Been there, done that. After 4 years of it, decided to get it out. I don't miss it, but I don't fool myself into thinking it was entirely without consequence. 

All I can advise is eat small, frequent meals, make sure they're high-nutrition, and make sure they're alkaline where possible (so basically stock up on veggies, keep it relatively low fat, and consider a GERD diet). Listen CLOSELY to your body: track symptoms with journal. Also, food. Also, your emotional state, because that matters more than...well, more than I ever thought. 

Your weight loss will eventually slow down. It may still keep going, but work to make sure you're not hitting any nutritional deficits. Since you say you're overweight, use this to your advantage. A good multivitamin can help here. (Expect to pay. But yes, a good multivitamin is worth it.) 

For me, drinks like Huel and Soylent have worked OK, but I do get some refluxing from them, so I supplement them with something like a piece of bread. Protein shakes are good, too, because they deliver a lot of nutrition (but not a lot of calories; I'm personally a fan of the Vegansmart line). The goal is to make sure you're getting in no less than about 1500 calories per day. (Don't do it in just protein shakes like Vegansmart.) Yes, you'll lose weight, but this should be enough to keep your energy levels up and for you to make sure you keep your nutritional requirements in check. 

Best of luck!

I can also totally relate to this. I've had reflux on and off over the years but in July it hit me like a train. I found it very scary and my anxiety went through the roof which then in turn, made the reflux worse. I could hardly eat and then scared to eat. I've lost about 25 pounds since then. I've never known weight drop off so fast. I was overweight but it's quite worrying when you loose it that fast. I'm trying to watch everything I eat and I'm taking advice from a nutritionist. Tests showed a small hiatus hernia and reflux but that's all really. Vitamin b12 low but looking into that. I'm just hoping I will be able to eat normally again one day 😔

Hi DTSFA this is Leslie and yes I to lost a lot of weight myself before I found out that I had Greds really bad last year I drop 25 pounds in six weeks before I want to my doctor like you I am a little overweight my doctor did tests and when the the tests come back it showed that I had greds because when I eat anything it was not long before it come back up so he sent me to a chest doctor and he did his tests he took me to surgery and did the nissen fundoplication warp everything was going great for six or seven months post op then little  bit by little bit my symptoms return so in June I want to see my ears nose and throat doctor and told him that I was having problems again so he sent me to a new doctor that dose nissen fundoplication wrap surgery for the doctor that did my surgery wasn't either not in his office or was too book up to see me some doctor eh and during my six Seven months where I was feeling really good I was off my reflux meds eating and drinking anything I like and then I started to loose weight again before I saw my new doctor I lost 15 pounds is three weeks time so he did his tests an when he got the reports back it showed that the doctor that did my fundoplication surgery last year he did the wrap way way to tight and it give me a new hernia as well so on 10-11-2017 I going back in the the hospital to have a redo fundoplication surgery first thing he is going to do is to undo the wrap fix my new hernia clean up scar tissues insert a mesh and a feeding tube which he is going to remove three days post op and I be in the hospital for one week then I be back a liquid to a soft food than back to regular diet but I like my new doctor very much he kind caring and takes the time to listen to his patients and try to do his very best for them I been to lot of other doctors they send me for some test but don't take the time to listen to what I have to say well if they don't have the time for me I don't have the the time for the for the door swing both ways on that one let me tell you so with DTSFA it was go tallking to you keep me up to date on how things are going with you and I shall do the same with my up coming redo fundoplication surgery as well take care very truly yours Leslie 

Hi DTSFA this is Leslie it only 19 days left to go before by redo fundoplication surgery i 

judt be glad when it's over and done with and I can start feeling like myself I who's you lots of luck at the doctors tomorrow 

Hi DTSFA this Leslie good luck at the doctors today let me how it goes boy I be glad when my surgery is. Over and may then I can start feeling better.again so keep in touch and let's talk soon very truly yours Leslie

Hi DTSFA this s Leslie and neither have i until my new new doctor said I have to do a redo fundoplication surgery I will keep you posted on how my surgery went so take care and let's talk soon Leslie