Although I couldn't say for sure what the cause might be, this could be linked to symptoms of a urinary tract infection or cystitis.
Especially as you have a sore back (which may or may not be connected), I'd recommend you go to your doctor as soon as possible as we don't want to risk the infection spreading.
In the meantime, I'd continue to drink plenty of water, some good quality Cranberry Juice and our Uva-ursi taken up to 5 times daily may also be useful.
Best wishes,
Emma
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