Well, my gastro poking around was yesterday and was uneventful. I was a very cheap date for V Day dinner - Mr Katie and the Teen had chicken meatball soup ... and I had the strained broth, followed up with loving made yellow jelly. Parts of the prep didn't agree with me in a not normal way, but when I rang the after hours number, the specialist didn't ever call back, and didn't mention it the next day. So I guess the rest of the prep worked well enough.
The gastroenterologist saw nothing physically wrong related to reflux symptoms, and nothing to have caused sudden iron loss. I guess that's a yay. :/ He took a biopsy for coeliac disease, but didn't think it's likely to come back positive.
I asked for an iron injection while I was there, and got one during the first stage of recovery. Yay! Iron Woman!
I guess I'd better start an elimination diet to see what foods/drinks seem to trigger reflux in me. Just like my rosacea a few years ago, it seems most of the fun stuff is on the list of triggers.
Off to the endocrinologist in a few weeks time, though I'm less worried about the Hyperparathyroidism. Maybe soon I can go back to just being a regular stressed out parent of a neurodiverse teenager!