High cholesterol is also a symptom of hypothyroidism, and your bears out the need for an increase in medication, as does your
weight gain, fatigue, anxiety, etc
Ferritin is the iron storage hormone and does indicate the amount of iron in your body... you should have a complete iron panel to make sure hemochromatosis is not causing your high ferritin levels. High ferritin is also caused by inflammation in the body, so a cold, flu or some other illness could easily explain the high levels.