really bad back pain

i had a question and i dont want to go to the dr. right now. for it could be nothing more then a muscle but i woke up last night to my back and stomache hurting and i turned on my sides and it hurt even worse. the only way of releaving it was laying on my back. i couldnt sleep so i got up and the pain when i got up and started walking was excruitiating. it felt like back contractions when your in labor. i started crying. :-( so i sat down and it didnt ease up and then i layed down on my back and after a little bit it finally eased up. then i tried getting up again. i sat up and it felt fine. and i got up and it started all over again.the pain would wrap around my stomach and make my stomach hurt and my boobs hurt it also hurt to breath. so i had to lay back down. the next morning i got up and i hurt a little bit but gradually started to get worse again. so i dont want to get up but i have 2 small kids that i have to take care of and if you have kids you know you have no time to sit down. i dont know if its just a muscle or if it has to do with my kidneys. anybody have any answers? thanks