Welcome to HCM. I have gone through the question and understand your concerns.
Please upload the thyroid function reports to us. Here the T4 alone is elevated all other investigations are normal. The possibilities are
1. Early thyroiditis
3. Early hyperthyroidism
Your symptoms are not correlating with your lab tests. I suggest you to repeat the lab tests and have a detailed evaluation for your symptoms.
Hope I have answered your questions. If you have any further queries I will be happy to help you.
Dr Ajish TP [MD,DM]