I feel like there is a bulldog sitting on my ribs. It’s hard to breath, and my lower back feels…

I feel like there is a bulldog sitting on my ribs. It’s hard to breath, and my lower back feels sore. I had it all day yesterday until bed time, I woke up feeling fine so I thought the baby was just growing but nope! I feel like I have a waist trainer squeezing my guts! No position is comfortable. Are these Braxton Hicks? Ugh