Why does my belly feel heavy when I lay down. Why do I have a burning sensation when I wake, how long will this last? (photo)

Also, how long until I can sleep through the night comfortably? I am 21 days post extended tt. The sensation of heaviness reminds me of the last months of pregnancy. I feel the heaviness when I lay in any position. I roll around through the night seeking a comfortable position. I sleep with a pillow between my knees, knees bent and hugging a pillow. I am sleeping (and living) in my girdle. I am not swollen when I wake and the burning only lasts for a few moments. Thank you for your help.