I agree with you and have seen a few cases that I think are like this on the forum recently. It's a horrible illness because the belief that they do have a physical illness makes it so hard for them to hear people when they suggest it might be HA.
On the other hand, I spent 10 years asking doctors to do something about my heavy, painful periods, to no avail. I was told repeatedly that it couldn't be something like endometriosis, and that it was part of being a woman and to take pain relief and ride it out. Finally, a competent gastroenterologist sent me to a gynaecologist who proved by biopsy and photos from the surgery that I had severe endometriosis. 10 years! Let that sink in. If I had been desperately trying to have a baby and couldn't, the delayed diagnosis might have been the problem. I suffered so much, unnecessarily. I can never forgive those doctors who fobbed me off, when they had a duty to know the signs and get me the diagnostic surgery.
So, sometimes, people should be believed about the physical symptoms, while other times, the best thing for them would be to stop and listen, and learn about HA and get treatment for it.
The hard part is figuring out which problem they have. I encourage people to seek diagnosis of their physical symptoms, so that actual illness is not missed. But there comes a point where the likelihood of actual illness is low, and they appear to have the hallmarks of HA.
If you strike this and you're getting bashed about it in a thread, tag me and I will come and look at it and probably back you up.