You can expect your weight loss to be a bit slower until they get your meds adjusted.
For yourself, if possible, schedule a visit with a nutritionist. My doctor has one in his office. She worked out a food plan for me that is great and really got the weight off. I never knew hypothrodism can cause difficulty with carbs...my old favorite food. I now eat 10 servings of protein a day and only 4 starch and 2 fruit, 3 dairy and 3 fat.
I also had to get walking. Walk at least 150 minutes a week and it helps to do some everyday, regardless of what other exercise you might do.
Don't try to cut down too far or it will slow you thyroid even more. Read labels on meds - many interact with thyroid meds. Take you meds on an empty stomach 1 hour before you eat.
A good site is
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Good luck! Come on over to the thyroid thread and post there.