Another thought is that when taking T4 type meds, many people find that they do not adequately convert the T4 to T3. So it is important to always test for both FT4 an FT3. In addition hypothyroid patients should be tested for Vitamin D. B12 and ferritin. All three are very important to obtain best effect from thyroid. What is your dosage of T4 med?
What was the actual result of the “normal” Free T4, along with its reference range? Just because it was in the lab’s normal range doesn’t mean it’s normal for you.
Yes, a steroid shot could contribute to your symptoms, though I’m not sure it would cause all of them.
Did you happen to get a regular comprehensive metabolic panel with sodium/potassium/chloride? Sometimes you can tell if your adrenals are out of whack by looking at those numbers.
So this started after using a generic? Who was the maker of the generic? Should say on your Rx bottle. Some of them are quite different from one to the other. Did you know you were getting a generic instead of Synthroid?
How long did you take the generic before you felt it was problematic? Do you know what your TSH was before switching? If you didn't take it that long, not too sure the generic would've raised it so fast. Sounds like the dose. Does your doc test for Free T4 and Free T3 when you get labs? Those numbers are very important.