@Tittat50 FND is not a wastebasket diagnosis, it is a rule-in condition with positive clinical signs. It has been used badly by neurologists, and misdiagnoses happen as they do with any condition. It is also often very badly explained by clinicians, even when a correct diagnosis is made. However, this does not mean that any and every diagnosis of FND is incorrect.
It is a neurological condition, current research suggests it is a brain network disorder. When diagnosed properly with the positive clinical signs, it is a valid diagnosis, and there are plenty of neuros who do this. It doesn't mean that you're being fobbed off or that the clinician doesn't believe you.
It's often comorbid with EDS/ hypermobility spectrum disorder, POTS, and MCAS. This also doesn't mean it doesn't exist. Getting diagnosed with one of the common co-morbidities doesn't undiagnose FND, unless FND was a clear misdiagnosis. In my case, I have HSD, POTS, and FND. HSD does not account for my neurological symptoms. I understand in rare cases hEDS/ HSD can cause subluxations in the neck which may cause paralysis or other symptoms that may be misdiagnosed as FND. This would not result in the positive clinical signs required for a correct diagnosis of FND.
I understand your anger, and that you're trying to protect others. However, there are many of us with accurate FND diagnoses, and having to argue about whether or not we have it is tends to derail things when asking for support. I'd always advocate for screening for hypermobility disorders and POTS alongside FND, but that doesn't mean that a diagnosis of a more easily observable, but non-neurological, condition, replaces a diagnosis of FND. And seizures are either epileptic or non-epileptic/ functional/ whatever other terms. Insisting that seizures that have been diagnosed as non-epileptic must be something "serious" that isn't FND doesn't make sense; that's just the name for them.