The isolation precautions are just that - precautions. Because we're exposed to radiation in many forms over our lifetimes, the precautions are designed to limit your family members' unnecessary exposure. You aren't going to give them cancer if they come near you after RAI, unless maybe they have had 280 X-rays or MRI scans in the last five years and the RAI exposure is the last straw.
I had 10 mCi on a Friday, but the hospital refused to administer it until the nuclear radiologist had time to review my entire medical history. Apparently, I didn't look sick enough for him. So it was late in the afternoon by the time I could actually go home. My dog was at the sitter for the weekend (he's 18lbs and can't be more than a foot away from me), but my boyfriend refused to leave me alone. I begged, pleaded, even kicked and screamed and told him I didn't want him there, simply because I didn't think it was worth the risk. He thought it was - he was worried about me having a reaction or just being lonely. Now he's an ex and I'm pretty sure he doesn't have thyroid cancer. If I found out someday that he does, I might feel a little bad, but it was his decision to be around me while I radiated all over my apartment.
Because I had such a small dose and was so hyper (I think my uptake scan came back in the upper 80s or 90s - it was 2 1/2 years ago now), I'm pretty sure he actually received very little exposure. I called the nuclear medicine tech over the weekend and asked if I needed to take Monday off since I was told 72 hours of isolation but I received my dose around 4 p.m. on a Friday. She said I was fine to go back to work, but I sat out of our morning staff meeting since we all crowd around a conference table. I ate lunch alone and didn't pick my dog up until after work that evening. Everyone at work is healthy, my dog is healthy, I could care less about the now-ex, and the RAI finally worked after 22 weeks.
I did not experience itchiness. I did have the sore throat many others experience - it felt like strep for two days. I sucked on hard candies and drank a lot of water to flush my system, and did feel very hyper by Monday evening. I went back on the PTU for a few months, never stopped the propranolol (still haven't 18 months later), and was told to go to the ER if my resting heart rate ever reached 120bpm. It did once, about a week after RAI, but I simply took an additional 10mg of propranolol and was fine.
Like you, I also had minor TED when I did the RAI and took a round of prednisone starting before and ending a few days after RAI. I ended up developing moderate TED the same week that I finally went hypo, so my physicians and surgeon attribute the TED to my TSH skyrocketing, not to the RAI itself.
I'm still struggling to find the right dose of Synthroid, but my endocrinologist confirmed that I have no remaining thyroid tissue - which is good because I had a nodule/cyst/tumor on the left lobe that actually sent me to the ER two months after RAI when I could no longer swallow. As my thyroid died, so did the mass.
Glad to hear you're on the road to recovery. Let us know what the itching turns out to be.