Hello Rjburke1! A bit late Happy Birthday to you!!! May all your wishes come true!!!
And now to harsh reality… =)) I am not a fan of shakes that replace two meals a day and such a low-calorie diet kept for a long time… with your hormone disorder, you might never know how your body will react so such strict caloric limits. I would not advise such eating regime to anyone with low thyroid function, simply because your metabolism is already slow… eating less than 1200 cal a day (and not eating. but drinking) might slow it down even more. That is my opinion.
It is fantastic that you don’t have cravings and hunger… however, I would suggest you to switch to normal healthy nutrition, i.e. 3 main meals (small serving) and 2 healthy snacks (proteins, nuts, vegetables, fruits), higher water intake and increased physical activity.
In fact, we have another lovely young woman, who started almost the same day as you did. She also has Hashimoto’s (here’s her blog Hashimoto's Disease). I am sure you guys will find something to discuss and share. She goes pretty well, so her experience might help you adjust your eating and exercising regimes a bit.
Yes, we’re all different, and she might be losing weight faster than you. But what I always have to say to people with any hormone issues is: be proud and happy with any loss. So CONGRATULATIONS with your first result and I will keep my fingers crossed for your success!!!