Yes, this "could" be thyroid hormone related, though not necessarily thyroid related... Your Free T4 is only at 11% of its range; it's recommended that Free T4 be about mid range. Your Free T3 is actually below range and most of us feel best with Free T3 in the upper half to upper third of its range. Free T3 is the hormone that's used by all the individual cells in your body and most of the Free T3 we have comes from the conversion of Free T4...
With Free T4 and Free T3 as low in the ranges as yours are, we'd expect your TSH to be much higher, since TSH, typically, increases when thyroid hormones are low and decreases when thyroid hormones are high. Because, both, your TSH and thyroid hormone levels are low, we'd expect you to have Secondary or Central hypothyroidism. Central hypothyroidism is a pituitary malfunction, rather than an actual thyroid problem. With Central hypothyroidism, the pituitary gland doesn't produce enough TSH to stimulate the thyroid so it will produce adequate thyroid hormones.
Many doctors miss Central hypothyroidism, because they focus, solely, on TSH, and when it's low or in range, they automatically, think everything is good.
Do you have other symptoms besides the pain you mentioned?
Have you had Vitamin D tested? Vitamin D deficiency can cause odd symptoms, such as that, as well. If you haven't had it tested, try to get it done. Vitamin D levels should be 50-70 to be optimal.