Helpp 34 weeks pregnant back and rib ache in agony im crying atm nothing helps?

hi im 34 weeks pregnant this is like the 3rd time i hav asked a similar question. thing is i have agonising back ache and rib ache under my that is. i have tried everything possible i even went hospital they mentioned a water infection but i didnt get anything for it. they also mentioned my uterus is very hugh what does this mean? also he gave me some co-dryamol tablets which i can take 2 every 6 hours well there all gone now and anyway the last few doses i been taking were not helping they used to help it was great but now its back 2 nothing bein able to help. im sat here crying my eyes out again i have a 17 month old daughter as well and i know me cryin is not helping her either. i have a doctor appointment tonight but its for 7pm and i know the chemist is shut and they way things are right now im not sure i can manage much more. i have ate something as well which seemed to make eveerything worse and i went for a walk 2 shop earilier it was all ok till i cam home and sat down again. im so tired and i know im anemic but i am silly and dont take my iron right now i feel like colapsing on floor and going sleep i feel drained. the pain is dying down but im upset still knowing its going to come back again with a vengence and im sscared cause its really awful i feel like i cant breathe at times. i want this baby out of me i hate being preg and im starting to resent ever gettin preg im sorry that sounds awful but thats how much pain im in i jus cant stand it anymore :(