Is it difficult to treat subclinical hyperthyroidism?

Hi doctor,

I am 27 years old, and I have multiple symptoms including nervousness, anxiety and weight loss. These symptoms are troubling me a lot. I experience extreme nervousness, even when I do not have any emotional struggles. I have a feeling of having a fast heartbeat. At the age of 16, my blood report showed me a result of subclinical hyperthyroidism. I have done breast surgery. Due to my health concern, I always have my blood tested for thyroid. Before eight months, I also had done a Holter monitor, which showed my heart palpitations. On my final blood test, my thyroid results came normal. But still, I have the symptoms. I am trying for a baby. But I heard an issue that underlying or undiagnosed thyroid issue could become a terrible one during pregnancy. Do I need to consult an endocrinologist soon? Do these fluctuations are common in hyperthyroidism?