Yesterday I was leaving Florida on a flight back to Chicago with my family. We had a great week long vacation there, but suddenly, I awoke with this horrible feeling. My heart felt strange, I was shaky, I was nervous, dizzy, chills, increase bowel movements and felt extremely frightened and I don t know why. At the ER they gave me a shot of Ativan and suddenly all my symptoms went away. I was sleepy the rest of the day, but I got home just fine. Could this have been a panic attack? I also have a thyroid condition and I take Synthroid. I was told that my Thyroid tests were high and I need medication adjustment. Could this have caused these symptoms?