I'm 69, had TT in Dec '11, no previous thyroid meds. My RAI and WBS was done 30 days post-surgery, and being hypo was short-lived and not too bad. I didn't have Synthroid until after WBS, just low dose Cytomel. I'm guessing it would be harder to go hypo after being on meds for a year. Will be getting the Thyrogen shots for my 1st anniv WBS in Feb '13 and wondering what side effects to expect.