Your symptoms, however, particularly, the thirst and dehydration, hunger and eating more with weight loss, pale, itchy
skin and red bumps are more indicative of
diabetes. I suggest that you get tested for that, along with getting your thyroid hormones levels tested asap.
With your history of, both, hyper and hypothyroidism, you should be getting your thyroid levels tested every 3-4 months, if not more often.