Difficulty breathing at night

Hi 😊for the last few nights I’ve been waking up gasping for air unable to speak or swallow for about 2-3 minutes before I feel like I can get enough air through and swallow and talk again. It’s like a gasping and closed throat. It only happens when lying flat and if I use about 8 pillows to prop my head up it’s not so bad. anyone else have anything simile? I’m still pushing for a scan of my thyroid and got a dr call this morning so if it is thyroid linked I’ll bring it up to her. My current TSH is 24.19 T4 is 6pmol. Thank you 😊