Yes, the TPO ab is slightly over the range. That is a possible indication of Hashimoto's Thyroiditis, but your TSH has not gone up. So that means either early stages of Hashi's, or if the TPO ab test is a flier, then central hypothyroidism might be the problem. With central there is a dysfunction in the hypothalamus/pituitary system resulting in low output of TSH and thus low inadequate levels of FT4 and FT3. In either case, you have many symptoms that occur more frequently with hypothyroidism than otherwise. Symptoms should be the most important indicator of thyroid status, confirmed with tests for FT4/FT3/RT3.
When you have symptoms like yours, I don't understand how the doctor can ignore them as being possibly hypothyroidism, and point in other directions. Instead he should be starting you on a therapeutic trial of thyroid med adequate to raise your FT4 and FT3 into the upper half of the range and evaluate the effect on your symptoms. Such a trial would not be detrimental. If there were any indication of becoming hyper as a result of the med, you just stop the med and your thyroid system returns to prior. Nothing lost that way, but a lot of potential gain if the tentative diagnosis is verified.
If your insurance restricts your choice of doctors, and you can't get a referral except to a specialist , which your doctor resists, then you are going to have to become very insistent that he read the link I gave you and do all the recommended tests, including cortisol, Vitamin D, B12 and ferritin. Also you might be able to get his attention with a one page overview included in my Journal, on my personal page. Just click on my name and then look for the Journal. If nothing works to get him to reconsider, what options do you have by complaining to the insurance company, or the medical group he is in, about your inadequate treatment?
With your symptoms and test results I am going to focus on thyroid. Just because thyroid test results are within the so-called "normal" range does not mean they are optimal for you. Everyone can have different levels at which they feel best. In addition there are other variables that affect your thyroid status besides serum thyroid levels. In addition, the FT4/FT3 ranges are far too broad due to the erroneous assumptions used to establish ranges. The ranges are not established based on test data from healthy adults with no thyroid issues. For a better way to assess your test results note the following quote from an excellent thyroid doctor. The ranges are different than for your results, but the message is clear because your FT4 and FT3 are only at 18% and 16% of their ranges, which is far too low.
"The free T3 is not as helpful in untreated persons as the free T4 because in the light of a rather low FT4 the body will convert more T4 to T3 to maintain thyroid effect as well as is possible. So the person with a rather low FT4 and high-in-range FT3 may still be hypothyroid. However, if the FT4 is below 1.3 and the FT3 is also rather low, say below 3.4 (range 2 to 4.4 at LabCorp) then its likely that hypothyroidism is the cause of a person's symptoms."
You haven't mentioned what your doctor has had to say about your symptoms and test results. I can tell you that a good thyroid doctor will treat a hypothyroid patient clinically, by testing and adjusting Free T4 and Free T3 as needed to relieve symptoms, without being influenced by resultant TSH levels. Symptom relief should be all important, not just test results, and especially not TSH results when taking thyroid med. Many of us have found that we needed FT4 at least mid-range, and Free T3 in the upper third of its range, and adjusted from there as needed to relieve symptoms. In addition hypo patients are frequently deficient in Vitamin D, B12 and ferritin, so you need to get those tested and supplement as needed to optimize. D should be at least 50 ng/mL, B12 in the upper end of its range, and ferritin should be at lest 100. You can confirm what I say by reading at least the first two pages of the following link, and more if you want to get into the discussion and scientific evidence for all that is recommended.
http://www.thyroiduk.org/tuk/TUK_PDFs/The%20Diagnosis%20and%20Treatment%20of%20Hypothyroidism%20%20August%202017%20%20Update.pdf
So I suggest that you should discuss all this with your doctor and ask to be treated clinically, as described above. If he resists, give him a copy of the paper and ask him to read and reconsider. If that fails, then you need to find a good thyroid doctor that will do so.