thanks for writing to us.
levels can fluctuate due to a variety of reasons. ;
a. Change in the time you take the medication
b. Change in the labs you;re getting the test at
c. Disorder called Hashimoto'ss thyroiditis
can cause such a situation
d. if you continue to take the same dose of the drug when your thyroid hormone levels are fluctuating.
Please see an endocrinologist
. This thing needs specialty treatment