The labs suggest mild underactive thyroid. You may have never fully recovered from the thyroiditis last year. Would test thyroid antibodies, as if these are positive, the hypothyroidism is likely not to improve on its own. With these symptoms, a trial of treatment is worth considering.
I am sorry that you are having difficulties. I think it is time to find another doctor. TSH 4.something is not really or dangerously high but your doctor is wrong..... You are hypothyroid - although it could be beginning stage. A healthy thryroid works with a TSH of 1.5 or so. Anything above 2 should be an alarm and if you have symptoms you need to take thyroid medicine. Most doctors prescribe Synthetics - which may work somewhat but deffinately make you feel better. They did not work for me after a while and I switched to Armour which is great for me but that is another story! I think you need to go to an Endo and tell your symptoms, let them run a few tests like TSH again, T4, T3, FreeT4, FreeT3, thyroid antibodies (TPO). You can have high antibodies which indicate Hashimotos thyroiditis (I have that) and that will make you have those symptoms with normal TSH and thyroid results too! Unfortunately most doctors do not know much about thyroid (there are exceptions!!!) so you have to educate yourself about this disease and how to live the best way even with the condition. Don't give up and find another doctor that will work with you. Your dr. is wrong about the range - the up to 5.5 range is no longer valid - she can contact the clinical endocrinologist association and check on that or have her do some reseach to find it out if she does not believe you. Good luck!