severe back and rib pain

hey guys , just wondering if anyone else has experienced a crushing type of pain in there ribs and around to the middle of their back? i’m not sure what causes this pain whether it’s the baby’s pressure? something i’ve eaten? posture? i’m really not sure. the pain is so bad it feels like extreme crushing and i don’t know what to do with myself, i can’t breathe with the pain, nothing helps like paracetamol or rennies or anything. the last time i had it i got so angry because the pain was so unbearable that i was screaming and kicking things out of anger because nothing was working. however i have found when my partner runs his hand down my spine he hits a point that relieves all pressure as soon as he removes his hand the pain is there again, the other thing that works is lying flat on my back so all points in my back are on my mattress and this then relieves the pain from my back and rib cage. the pain is so bad a car could be crushing me. i have been to see doctors and midwives and no one knows what is causing this. the times the pain has started has usually been after i have been sat on the toilet, i get hot sweats and then that pain when standing up. it can last for hours on end one time it lasted 6 hours and only relieved when i was eventually sick (this was before i knew laying on my back helped). has anyone else experienced anything like this?