Yes, high TSH is hypo. Get the repeat test, and if you are still at 5 you probably should consider taking medication.
I actually recommend getting a little more iodine if your current diet is void of it. Make sure your table salt has iodine, and if you eat a lot of packaged foods, know that from my own research tney do not use iodized salt from what I can tell.I have called Campbells soups and Stouffers frozen and they both say their sodium is not iodized, and their food is so salty you never typically add more table salt. I buy several things low sodium so I add my own salt when not cooking from scratch. I am not saying take some megadose of iodine every day, simply that there is an assumption that Amercians get plenty of iodine in their diets and I don’t believe it.the same as I don’t believe we get plenty of D and some other nutrients. It was different when we all cooked from scratch, and farms rotated their crops. Our midwest was known as the goiter belt, which was corrected somewhat with the addiction of iodine in salt.
I would not wait too long to repeat your thyroid tests, not more than two months. I once had around a 5 and it self corrected many years ago. Years later I had a perfectly normal 2.2 TSH, I checked it every year, and then three months later I walked myself int the ER and found out my TSH was 94.6.
I feel best when my TSH is between 2–3. Most endocrinologists like patients between 1–2. Below 2, my blood pressure drops very low, my heart races, and my hair starts falling out again. My advice is to pay attention to when you feel good and what your numbers are if it turns out you are going to be dealing with thyroid issues. You tell the doctor your normal, not the other way around. But, it takes time to figure it out.