Why do I have dizziness and fainting?

Could my back/spinal pain and my fainting/dizziness be related?

• NOTE: do not answer if you do not have medical training/ know how!! I am a 22-year-old female in good health except for the following issue and severe acid reflux. I am thin and tall.  I passed out on Monday after experiencing the same symptoms I've been experiencing for awhile now: after rotating my back or straightening or extending my spine, typically while standing severe dizziness and bizarre shakiness almost to the point of convulsions;seizure-like followed by  spotty and blurry vision that sometimes progresses to  blindness. I get severe weakness in my limbs as well as tingling.    This past Monday I blacked out all together and woke up on the floor of my bathroom in extreme pain.  have no clue what these dizzy spills could be related to. I am not orthostatic positive or dehydrated. I often times experience a burning hot pain on the left side of my back towards my side when I'm in the car for more than an hour and I get a similar burning pain in my heels. I have kyphosis. I have had severe migraines my entire life.  I am hypermobile in most of my major joints as well as in my spine and neck.  I know there's a chance I could have EDS Ehler-Dahnlos syndrome or Marfans syndrome) and I have appointments scheduled in October but who knows if that's related.  I have heard of dural ectasia in the Marfan community but I'm not sure if my symptoms match up. 

• Answer:

  This could really depend on your nationalites, if your irish mixed with black, or irish mixed with spanish. Or a weird mixture of things then your gonna have crazy problems blame your parents