Forgot to mention that fatigue is also a symptom being hypo. Just getting TSH won't tell the whole story; try to get FT3 and FT4, as well, since those are the actual thyroid hormones.
Things in your body can change over time, requiring adjustments in med dosage.
I get the cramps when I am a) hypo, even if labs are "in range", b) low in potassium or c) dehydrated/not drinking enough liquid.
Recommend that you get FT levels tested to make sure they are adequate and check potassium levels.