I don't know if it's because of my thyroid, new food allergies, any nutrient deficiencies, etc.
Taurine is found in animal products. So this is another reason you wouldn't want to be a complete vegan. Please read the articles below to see what foods contain taurine. Taurine deficiency can cause heart and eye problems. (hence I was looking for the cause of my heart arrythmias) Also remember vegans should get their B12 checked regularly.
The first link below is to a book on Amazon that is great for symptoms of deficiencies and how to correct those deficiencies. There are also quizzes to determine deficiencies as well. This is a fact packed book that I will try to buy. I first found it at my local library!
http://www.amazon.com/Nutrition-Test-Better-Health-Personalized/dp/1931078084 "Nutrition Tests for Better Health" by Cass Ingram
http://www.pyroenergen.com/articles07/taurine.htm Info on Taurine
http://www.vaxa.com/aminoacids-taurine.cfm More info on Taurine