@SadieM1210, sorry my diet advice was a bit out of sync with where you are now. Sounds like Scott F has given you some good leads.
I too am always amazed when a medical person just sort of blanks you and lets you walk out with ongoing serious and debilitating symptoms and no follow-up plan.
For ten years I’ve been trying to get help with a fainting/blood flow disorder, and this is what happened every time until I started pushing back and demanding to be sent to certain specialists.
I have read many people with many illnesses saying the same thing. Of course, afterwards, you want to say that “You can’t leave me up the creek with no paddle”, but at the time it is so dispiriting that you sort of stare at them in disbelief.
I am practising now how to speak up for myself on the spot, although whether I can do it is another matter.