I was started on 25 nhs of Thyroxine four weeks ago. I’m sick of listing my symptoms but the main one that’s had me off Work is my feet and knees I’m in agony and I’ve notice pockets of odema around my joints. I feel as if no one believes me when I say it’s agony. I’m due to go back for another blood test to check my levels at Christmas. When will it kick in?