It took about 2-3 weeks for me to actually start feeling any better. The doc put me on a beta blocker called Toprolxl. I had high bloodpressure and was in pretty bad shape. Also I took tapazole for awhile. Started seeing another doctor and he changed me to PTU. He thought it was a better choice. I don't know any difference in them. With tapazole, you can take less, and more when on PTU.
The Toprolxl really helped calm me down pretty fast. It is for slowing the heartrate down, high blood pressure, anxiety.
Hope you get to feeling better soon.