Hi all, I was diagnosed with hypothyroidism 20+ years ago and put on levothyroxine 75mcg increasing to 125mcg, I have ticked along very nicely all this time and never questioned all the numbers T's etc when my doc read them out, so I've never understood what they all mean. Recently a different doc said my levels are too high and promptly reduced me to 100mcg then 75mcg, after 3 Months I feel dreadful tired lethargic and gained over a stone weight and I can sleep for England! I am also taking anti depressants and Asacol for UC . Can anyone explain basically what the numbers will mean when I go for my blood test this coming week so I can properly discuss my thyroid levels with my GP. Thankyou in advance.