Hi I Am Taking Levothyroxine For Hypothyroid Consistently Now Since

hi i am taking Levothyroxine for Hypothyroid consistently now since January...i eat vegetables, lean proteins, salads, nuts, protein shakes. I exercise at least 3 times a week. My intake of carbohydrates is below 200 per day. i am at the same weight I was when i delivered full term at 9 months. When I wake in the morning i don't want to stand on my feet because the weight i'm carrying is too much from body and my feet, ankles and heels actually hurt when I stand. I can't lose the weight, i'm frustrated what can I do? I weigh 156 lbs i'm 5'6"...