This time last year I was running 10K in under 55 mins. Now, I am struggling to complete 3k. I have an enlarged thyroid with multiple nodules and cysts and although my hormones levels are "normal" I feel lousy. I haven't run at all for 2 weeks as the idea fills me with dread because I know what a struggle it will be. I'm exhausted, irritable and finding it difficult to concentrate amongst other things. I'm due to see the ENT surgeon next week and hope I don't get fobbed off because of the normal blood results.