I had RAI about two years ago for over active thyroid. I then became very underactive. about 3 months ago I started having severe panic and anxiety attacks. I was put on diazepam by my doctor and my blood tests said that I was a little over active again so to lower my thyroxine levels form 75 to 50. its been two weeks and now the panic has gotten so bad I cannot eat, the diazepam seems to have no effect and was wondering if this is normal for lowering dose of thyroxine? I am so desperate, I feel so ill and shaky all the time, I feel worse than before. everyday gets worse. beta blockers didn't agree with me. can anyone help me please??