Thank you Hopeful. My husband was on Sinemet and then also on Primidone (for the benign essential tremor). He is now off the Sinemet to see if the tremors become worse (which they have not). He is still on the drug to treat the essential tremor but still has tremors. It's a bit of a mystery what he does or doesn't have. The doctors can't seem to identify anything that causes the head rushes. He also has COPD but the doctors don't think that's contributing to the tremors. It's a real mystery.