For what reason was RAI done in the first place? Do you have Graves Disease?
What "level" are they monitoring? They should be testing Free T4, Free T3, which are the actual thyroid hormones, along with TSH, on a regular basis.
If you could please post your current thyroid hormone levels, we'd be better able to help you determine what you problem might be. Be sure to include reference ranges with any lab results, since ranges vary from lab to lab and have to come from your own report(s)...
It would also be helpful to know what your current dose of Armour (if that's what you're taking now) is.
Also, do you take the medication all in one dose or do you split it into more than one dose throughout the day?
Yes. I was on synthroid for 16 years. When they tried every dose. Or would have me skip a day take one for 2 days skip a day. They never could get it to level out. So I went on Armour Thyroid 3 years ago. Things are slightly better. But nowhere near right. My thyroid level they have been keeping it at a dangerously low level to keep me eating and sleeping about the same amount of food a toddler would eat is a good meal for me. But no matter how low they make my level go I still exhibit extreme hyperthyroidism when my tests show extreme hypothyroidism. Any advice you have would be awesome. I don't know how much more of this I can take.
Have you had thyroid labs done? Are you already taking thyroid medication?