Sharp Pains and So called Vertigo

I am a 34 year old female. I would say that I am in good health, never had anything major wrong.  However I have been suffering from heart palpitations for about 20 years.  I have all of them, the racing heart(rarely) skipping beats (daily) butterfly feeling(often) Bradycardia (often) and extra beats (often).  I have had the haltar monitor a cardiac mri, echo, and noone can seem to find a problem with my heart.  Anyway, about 4 weeks ago, I had bent over to do some laundry and when I went to stand up I had an enormous rush in my head and I thought I was going to pass out. Well that feeling went away after a few seconds but was followed up by very unsteadiness, and a feeling in my head that I cant explain.  It wasnt dizziness and it wasnt lightheadedness.  It is something that is so hard to describe I cant even really begin except to say that its almost like my eyes and my brain were floating and my eyes wouldnt focus unless I was looking straight ahead.  I went to the ER and after all of the tests they came up with Vertigo.  After having read up on vertigo, Im not sure thats what I am experiencing.  It just doesnt sound like I have the real vertigo symptoms.   I had for the two weeks prior to the "big incident" been feeling the brain floating sensation and off balance, but I thought it was due to being tired because it was mostly happening after 4 in the afternoon.  However since the "big incident" I still have that brain floating sensation on occasion that lasts from an hour to all day.  I did notice that if I lie down for a bit it usually subsides but sometimes if I start moving around alot it comes back.  I went to the ENT and of course he didnt tell me anything because he cant see my inner ear or my brain so he wants to follow up with more tests in two and a half months.  I dont know about you, but for me this is very disheartening and uncomfortable.  I went to the GP and she did a balance test which I failed.  So a week after the "big incident" I started having sharp intermittent pains in my left temple with some pressure behind my left eye that has been going on for about 3 weeks now.   I am scheduled for an MRI and an appt with the neruro. I dont know if all these things are interconnected or not, but im tired of feeling lousy and im tired of not getting any answers.  Please help me.  Im at a loss for anyone to turn to anymore, I just get the run around from everywhere I go.