Just wondering if anyone else suffers with intense feeling of muscle exhaustion in their legs. Mine feel like I have run a marathon for no reason. Sometimes this is just in the evening and there are days like today when I have had this feeling from the moment I woke. They aren't weak as such just very fatigued, achy and heavy. I have recently started taking t3 along with my levo and I thought at first that it had sorted it but this weekend it's back to how it was. This has been getting steadily worse over the last few years really. Wondered if it might be something other than thyroid? Any ideas?