Trouble from being overmedicated on Synthroid?

I was over medicated. My normal dose is 137mg of Synthroid. My doctor okayed for me to move up to 150mg as I was complaining about symptoms during "that time of the month". Well, I was on the 150mg for 2 weeks, when I was absolutely positive it was too much. I called my doctor and he told me to skip a pill and resume the 137mg the next day. So, I did. During my one day off, my symptoms of being over medicated didn't go away, but got a little better. I started the 137mg the next day and two nights later, I was again absolutely positive that my symptoms were just getting worse. It was very scary! I had fast, hard beating heart, tremors like crazy, extreme nervousness, burning feelings on my skin (upper torso), my face was really red. I was so scared that I started crying and my face got really tingly all over. So, I went to see doctor and he said take 2 days off and he was going to put me on a lower dose (100mg). So, I took 2 days off, and this morning I called him because I still have some of the tremor and nervousness left. I am still waiting for his call back. I want to tell him that I am not putting anymore medicine in my body until my symptoms are completely gone. I spoke with 2 pharmacists who said Synthroid stays in the body a long time with a half life of 6-7days. One said I should probably take this 6-7 days off before starting at a lower dose again. The other agreed and said the MINIMUM amount of days I should take off is 3 days and then resume at a lower dose. I am trying to get in touch with my doctor, so he can fax a prescription to have my levels checked at the lab. My question is, am I more sensitive to this medication than most people. I have read posts that doctors just cut back the dosage and the person's body adjusts just fine. Why is this so hard for me? Thanks for any insight!