I had a I-131 full body scan last week following Thyrogen injections. My scan showed new thyroid tissue on both the right and left sides- I have no thyroid. My question is what has everyone noticed concerning side effects? I am extremely tired and just plain weak and shakey. I have had a constant sore throat, buring and dry. I have sharp pain in the front of my neck-not all the time, just once in awhile. I am a teacher and have been off work for a week and two days so far. I don't seem to be getting any better.