Hi. Ive been on levo 100mcg for last 14 years (started post partum after baby no 2). My weight has continued to increase over the years since then til i maxed out at 15 stone and joined weight watchers. Initially i did quite well losing nearly 2 stone in a year but then i found no matter how hard i tried i couldn't keep it off and put a stone back on .by November last year..so january i bought a cross trainer and after several months i am now exercising like a ninja 3-4 times per week for 25 - 30 minutes. I eat really sensibly, more or less following the weight watchers program 5days out of 7 .... But i feel so rubbish. I have palpitations, fatigue and aching joints (in joints unrelated to the exercise) and worst of all i am actually putting on weight (and its not muscle!). Has anyone any experience of increased requirements of levo with exercise? Ive read that maybe my requirements are greater now my body is doing more and cells might have increased requirement? Should i consider changing to NDT? I'm beginning to wonder if the levo has ever really done that much ? I had early menopause at 42 (Im 51 now) and never had a huge amount of energy. Im gutted that despite my best efforts I'm constantly battling the weight thing and having to constantly work harder. Or am i being a big woos and looking for an easy fix? Going to see my GP next week but I'm not really expecting any great understanding or insight. Their routine letter came for blood check as I'm on thyroxine, and it said they would only contact me if the results were significant - why oh why do GPs still not consider that how a patient feels is as important than the blood results.