Every adult human being needs more than 1200 calories to function properly and stay sane. So to read of 500 calories and below is absolutely insane. Please stop your starvation diet immediately, no matter how unhappy you are with your body! You will never lose weight eating essentially nothing. You will stall, crash and burn and damage your hormones even more. Your body needs fuel in order to burn fat. If you starve yourself, it will attack the very little muscle it has left. Please stop hurting yourself. If you are serious about this, calculate your TDEE. You cannot calculate caloric needs more efficiently than that. Another thing you will have to educate yourself about is how inflammatory foods (all dairy immediately comes to mind, gluten for some, or fructose) affect your thyroid. But at this time, having a more positive attitude is much more important for you than losing some numbers on the scale. Do not ever under any circumstances listen to people who tell you to go ketogenic or some BS like carbohydrates make you fat. Those are people who are not only eating disordered (a path you are currently traveling down as well), but dumb beyond repair.
I have Hashimoto's and while I lost about 14kgs on a cut, my body would cling to it's fat. So I went from overweight and chubby to optimal weight and what they call "skinny fat". I too am unhappy with my physique, but my body is there to perform, not to look a certain way. This is something you will have to learn to accept. And tune out other people's judgmental comments. People like us with thyroid conditions have less leeway than those with healthy glands and hormones. We are stressed and fatigued as it is. Worrying about our body shape or body fat percentage is absolutely inane when many of us cannot even control out weight.
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KΥΚΛΩΨ, ΕΙΡΩΤΑΣ Μ’ ΟΝΟΜΑ ΚΛΥΤΟΝ, ΑΥΤΑΡ ΕΓΩ ΤΟΙ ΕΞΕΡΕΩ·ΣΥ ΔΕ ΜΟΙ ΔΟΣ ΞΕΙΝΙΟΝ, ΩΣ ΠΕΡ ΥΠΕΣΤΗΣ.
ΟΥΤΙΣ ΕΜΟΙ Γ’ ΟΝΟΜΑ·ΟΥΤΙΝ ΔΕ ΜΕ ΚΙΚΛΗΣΚΟΥΣΙ ΜΗΤΗΡ ΗΔΕ ΠΑΤΗΡ ΗΔ’ ΑΛΛΟΙ ΠΑΝΤΕΣ ΕΤΑΙΡΟΙ.