Hello, I take high blood pressure medication daily, 10 mg Lisinopril and I also take 20 mg Simvastatin. Simvastitin has made me feel jittery and anxious for the year I ve been on it, so just recently I stopped taking it for a few weeks to see if I felt calmer. I felt better for a week, and this past weekend, the jitters and anxiousness returned, and what I can only describe as hearing my pulse in my head. It comes and goes. This morning, as usual I took Lisinopril, and tonight, I went back to taking Simvastatin. I ve never had such a feeling in my head; it seems to be worse when I m sitting. Also, I ve taken thyroid medication for hyperthyroidism since 2000 and several months ago, my blood tests revealed that I no longer was hypo, but hyper. I was taken off all thyroid medication, and my endocronologist recommended a take a nuclear test for my thyroid. Is this safe? And are there any tests that I can take that aren t so dramatic? I ve had an ultrasound of my thyroid (2 weeks ago) and I will know the results this week. Thank you.