As you indicated, there is recent increase in the dose of synthroid
. There is a high probability that the symptoms are due to hyperthyroidism
(high thyroid enzyme levels). Side effects of synthroid include headache, palpitation
and mood change. Another blood test
would clarify these given that it is associated with no/little complication. If all these symptoms are new then i suggest a blood test which may help adjust the drug dosage.
Hope this is helpful or at least clarify better the situation