For the first time, I found a doctor who tested more than just the TSH, which has always come back normal. I have all the symptoms of hypothyroidism, including being constantly exhausted and being unable to lose weight, no matter what I do. Here are my results- I notice the free T4 is low, but I have no idea what that means!
TSH 2.79 uIU/ml0.34-4.82
Free T4 0.47 ng/dl0.51-1.20
T3 Total 127 ng/d160-181
T4 is the thyroid storage hormone. Free in front of the T4 means you are measuring what is available and unbound. If thyroid function is good it will generally be in the mid-high range.
Your low free t4 + your symptoms would be a good indicator that you need some thyroid support IMO.
Good luck, I know these things can be hard to work through. Hopefully you have a good HCP on your side.