I too am on the Lid for the second time. Last year, post surgery and pre-RAI I was on the diet for over 5 weeks! The endo I had didn't seem to worry about his patients feelings, schedule, or convenience.
Short version: I found a new doc. The old one didn't believe in thyrogen, or even following the FACE or ATA guidlines for cancer management.
I am one week into Lid, with Thyrogen and WBS scheduled for next week and the following Monday.
Last time, frying the one allowed potato in olive oil (French fries, hash browns, chips, whatever,) saved me. Tonite, my lovely bride brought home some "no salt added" Hunt's ketchup. I'll probably toss it out, along with my "no salt added" peanut butter when I'm done, but if I have to do this again, I will certainly have it on my shopping list! I wish I could have found it last year. P.S: She found it at the local grocery store; It may be more readily available now.
Blessings to you
David