Hello Marzkitten and welcome!
Those you described in your post absolutely sound like anxiety symptoms to me. You have visited ER and got lots of tests with good results so I really doubt you have any sickness. Dizziness sure is the most annoying and most common symptom for anxiety issues.
You can visit the resources page here in forums and check for coping skills/breathing techniques. Here is the link:
www.healingwell.com/community/default.aspx?f=9&m=104206And here is the total of anxiety symptoms, so you can see how wide the symptom range can be.
www.anxietycentre.com/anxiety-symptoms.shtml#symptomslist I hope you really feel better soon. Please update us!