I am currently taking 3 grains of NDT (Nature Throid) - I have gradually increased and felt well and alert. However, over the last 5 weeks I have had really aching muscles in the shoulders, and now my knee is giving way - I have had physio on all three bits. I have gained all the weight I lost, it wasn't a lot but still... and I have had a bad head. I took my blood pressure twice yesterday 186/99 and 181/97 so it is definitely high. I haven't taken any NDT today . The last set of blood results were fine according to my GP. Any body else had anything similar?