I have asked that question too and I have pretty much found what you have. They say rads can contribute, but usually it wouldn't show up for many years later. I still think there must be some kind of link because I have read of other people with the same issue. I think it just needs to be researched more.
I was out of work about 2 weeks, but mostly just because I was a little tired. And, it was Xmas time so I figured I might as well have some extra time for the holiday. It took awhile to get back to normal after having no thyroid. Once I got on my thyroid medication, it was much better.
As for my recurrence, I was lucky. The lump they took out was smaller than my original and it divided at a much slower rate. Also, the lump I had in my neck came back negative for cancer. So, as weird as it is to say, I have been fortunate.
One thing I have learned over the last 5 years, enjoy life! Even on the bad days, I try to remember how lucky I am to be around one more day!
Good luck! I will be checking in on you!