Hello. My tsh over the last 3 months has significantly risen without reason. It has risen from 8 up to 27. Doctors have increased my thyroxine to 200 Mcg now but I'm not feeling drunk all of the time. Whenever I stand up I feel very lightheaded and often dizzy. I'm also suffering from heart palpitations when I carry out simple tasks like making the bed. Could anyone please explain or had similar problems?