I'm 22 weeks pregnant and not showing much. My bubba is kicking heaps (escpecialy when i want to lay down and rest)

Last ngiht at the supermarket, i had the weirdest feeling, like my tummy was stretching and it felt like my internal organs were rising into my throat. It was so weird. It instantly made me tired and i wanted to go home and lay down.

Has anyone else felt like this? Does anyone know what it means?