This morning I changed from 50mg Levo to ndt. I took 1/4 grain. After two hours I felt great, so energised! i then crashed and I'm so tired now... My heart is fluttering a bit. Could fall asleep. On the Levo I had a thick head and extreme leg pains all of these have already gone, didn't feel exhausted like this. I know it's really early days but did anyone experience this? I am planning on taking another 1/4 this afternoon.