I have been on thyroid supplements most of my life, after being diagnosed with hypothyroidism when I was five years old. When I was in my early 20's I didn't have a regular doctor, and thought for some reason I could do without the medication, and was off it for several years. I had less appetite, but also less energy, and my hair got thin, and my skin was dry, and I was depressed. So now I think of it like a vitamin pill.
Yes, adequate thyroid does increase appetite. So we need to be careful what foods we use to fulfill that hunger, and avoid addictive sugar-fat combos. But it also gives energy for exercise. It will take a while to find your "new normal," but please don't throw out the pills!