Well, I'm 41 ... so maybe it is an age thing ?
My 1st attack happend Xmas Day night and I had no idea what it was, just thought I'd obviously overdone it (but no alcohol or 2nd helpings ). It was only when it happened twice more that I realised there was something going on - and pretty much diagnosed myself by checking my symptoms on the net. I then went into the doctor and circumvented his questions by stating categorically it wasn't acid reflux or IBS (as I get both those too, such a wreck).
Yep - a really really bad stitch is exactly how I'd describe it, and it being hard to get my breath. I felt, after, like I'd been kicked by a horse. 4 days later when the doctor was prodding about I still felt very tender.
You know don't you, that the pain is when a gallstone gets stuck in the valve exiting the gallbladder ? It either passes through, or drops back in eventually (hopefully) so the pain eases after 4-5 hours. You can have them and never know about them, but guess that they "grow" with time and therefore have the potential to get "stuck". I used to have a dreadful diet too when I was younger, but either didn't have stones then, or they were too small to matter.
Since the last attack, I've been more or less living on apples, bananas, vegetable soup,bread (no butter), cereal, skimmed milk (which I always did anyway), fruit juice, chicken, fish and rice. I am truly frightened of encouraging more attacks.