I had RAI and then keyhole TT due to Atrial Fibrillations and a heart problem.
Sometimes the risk of surgery is too high when Hyper and they do RAI first.
I'm confused as to your whole story. You sent me a note about having nodules but I didn't see where you had surgery just RAI. You also said your nodules were cancerous but then only mention RAI. So I'm not sure how to answer. Post RAI after TT for cancer should have you starting meds right after RAI, but you don't mention that. Please feel free to PM me with any questions or just answer here and I'll respond, but right now, I'm at a loss.
And PS, welcome to the forum!
The swollen sore throat is normal after RAI but get your bloods done as I was HYPO, 5 weeks after RAI and put on Thyroxin.
I would say the throat irratation is from the RAI and the thyroid is dumping any excess radiation and Iodine.
Get your bloods done...FT3, FT4 & TSH.
Most Endos make you wait 6 weeks after RAI before bloods.
I have found from experience that it is too long to wait 6 weeks if you are drug sensitive like I am.
I had RAI done 7 months ago.