You know, Gerri,
Continual pain in your back could be a kidney issue...maybe you dont have just a bladder infection, but a kidney infection. If this is the case, you need to be seen right away. You should not mess around with kidney problems. A bladder infection that goes either untreated for a while, or isnt responding to treatment can travel up to your kidneys. A kidney infection is MUCH more serious that a typical bladder infection, and will usually cause severe pain in the back.
If I were you, I would call your reg. doc asap and tell them about the pain and if you have any fever. If they dont agree to see you, I would go to the ER as soon as possible. If a kidney infection goes untreated, it can lead to some much bigger problems.
Let us know what happens, but I wouldnt wait...OK?
For God has not given us a spirit of fear; but of power, love and a sound mind. 2 Timothy 1:7