Urgh I have been experiencing what feels like a gallbladder attack (not in the front though, only up my back/across my ribs at the back) and it was stressing me out!! I had my gallbladder removed last year so im TOTALLY SURE it isn't that lol.
I believe it's acid related as it is definitely related to a) certain foods (similar to gallbladder stuff so spice, fat, onion/garlic etc) and b) sitting or lying down too soon after eating.
I haven't had any reflux, acid anything like that or even heartburn (in the front) however...gaviscon seemed to help slightly (except it made me vomit as i drank so much in last pg then when gallbladder was waiting to come out). I HAVE discovered deflatine works - completely - pain gone!! I take probably 4 a day, either just before or after food. I'm still watching what i eat etc but the deflatine is honestly like magic......
I don't want to take it all pg so I'm seeing my gp soon to try and find a prescription alternative but in the meantime, give it a try x