Can An Alternative Of Levothyroxine Help In Managing Emotional Outbursts?

My sister in law has hypothyroidism. she takes levothyroxine. Recently her endocrinologist had to increase the medication because it was not enough. When she took the new dosage, she got very emotional. the doctor let her alternate the dosage: one day she takes the regular dosage and the next day she takes the new dosage. This does not help much because on the days of the higher dosage she gets very emotional. She starts crying when she doesn't want to.
Do you think changing to another medicine for hypothyroidism might help?
She told me also that she has Hashimoto.