Thank you for your reply l will see if l can get hold of my lab results.
Iodine is not recommended when one has Hashimoto's, as it can exacerbate the problem.
"not only can l not lose weight l also keep getting really painful mouth and tongue ulcers which research has suggested can be a side effect of thyroid problems." You're right, they are side effects of thyroid problems, "not" the medication!! Both inability to lose weight and mouth ulcers can be symptoms of under medication.
If you will please post your most current thyroid lab results, we will be able to better assess, both, your testing and treatment. Be sure to include reference ranges with any lab results, since ranges vary lab to lab and have to come from your own report.