Looks like (and your symptoms sound like) you are flirting with hyperthyroidism.
The cause of 80% of hyperthyroidism is Graves disease. Other causes can be a "hot" nodule which is overproducing hormone and struma ovarii (but since you don't have ovaries I don't think that would be applicable for you
The good news is that your doc is running the right thyroid tests!! Many of us have to struggle with our doctors to get the FT4 and FT3 run on us. Your results show that you are at the high end and slightly over the normal range.
With hyperthyroidism your FT4 and FT3 would be high and your TSH would be below the normal range.
I would highly recommend that you get the book "Thyroid for Dummies" by Dr. Alan Rubin and do some reading up on hyperthyroidism BEFORE you get your official diagnosis. This will arm you with the information you need to ask your doctor intelligent questions and get the answers that you need when you have your appointment. Also, there are 3 treatment choices for hyperthyroidism. We all need to make sure that we know everything we can about each choice before we decide our treatment course. There are ramifications to each....some are reversible, some are not. Make sure you make an informed decision when the time comes...this book will help you immensly with that.
Another way to check for nodules - that avoids radioactive materials (which to me is a good thing
) is to request a thyroid ultrasound.
The definative test for Graves disease is a TSI (thyroid stimulating immunoglobulin antibody) lab test. This would prove or disprove that you have autoimmune hyperthyroidism, aka Graves disease.
You can read more about Graves disease here: http://www.suite101.com/welcome.cfm/graves_disease