Hi,
What you have described sounds like POTS. Can you show your mother this website and the information on POTS?I would suggest a cardiologist for the diagnosis. You mentioned pain. Do you think you have EDS too? My first signs of the disease was all the orthodontic, dental, and gum problems. In addition I had orthostatic intolerance with the dizziness and fainting and I had abnormal scarring and healing. Then as a teen I had joint subluxations. Do you have other symptoms? If you think you have more going on a geneticist is the person to go to for a diagnosis. Welcome to the forum. I hope you can get help.
Shonda