Synthroid and extreme nausea

I have been on synthroid for 11 years. This past year, however, after stopping birthcontrol pill, my dosage has changed. First I was too high on 125-150 mcg and now I am back to 100 mcg. My TSH is 1.72 which is within the normal range of 1-2. My big side effect right now is extreme nausea especially after any activity, not even strenuous, such as doing some errands or grocery shopping or even up-down stairs. I have to sit really quietly before feeling slightly better. Has anyone felt this way? I feel sick all the time. Perhaps a smaller dosage of synthroid would help.