Have you had possible inner ear issues ruled as that can also cause dizziness? So can low blood pressure (lots of things can cause dizziness).

I am also on Synthroid (levothyroxine) and started on the medication in February 2024. The TSH was 15.5. In May it dropped to 1.4 and then to the .67 in a month and the dizzy spells were becoming unrelenting. My blood tests were done and I had a sodium level of 131. It seems today doctors have started treating patients through portal systems. It is the most frustrating and unworkable healthcare creation ever developed since the wait time for a response is 2 to 3 days. Then I finally hear from them and I get the brush off, or, "you're just getting used to the medication, or you're doing something wrong", etc. I was so debilitated I went to a clinic on the advice of my pharmacist. There was an NP in charge and he read my test results, and said you really need sodium. He gave me a Meyers Cocktail infusion and it was very helpful and now, I drink a V8 in the morning and the dizzy spells stopped over the last 3 days. I know it sounds so simple, but adding the high sodium drink seems has given me a few days where I am slowly letting go of the fear of the sudden onset of dizzy spells that happen unexpectedly. I know you're sodium level is higher than mine, but you never know.