It's awful. If you're female (or likely to be perceived as female), have *any* sort of weird medical issue, have chronic pain, are fat, or have one or more of a *long* list of other characteristics, you'll get treated as unreliable.
If you DO know medical terminology, you're one of those annoying patients who thinks they know everything.
If you *do* emphasize that you're in a lot of pain, you're clearly exaggerating and probably a drug-seeker.
Medical professionals are usually, at best, tired and cynical, and at worst, outright contemptuous or hostile toward patients.
After all, doctors are experts on how human bodies are *supposed* to work. You're an expert on how your body has been working for its entire existence.
So what can you do?
A lot of us have an easier time advocating for others than we do for ourselves. That's doubly true when you're not feeling well and are low on energy.
You can have a friend there as a patient advocate to back you up, remember what the doctor says, etc.
In which case they should be able to explain why that's so, and shouldn't be afraid for that to be on the record.
Make your own file. That way, if you go to get a second opinion, it's less likely they'll make you redo things you've already tried, since it's another doctor saying those things were done.
But make sure everything is documented, and make sure you get copies of that documentation.