Our expert says:
There are a number of possible reasons, including resistance to the antibiotics used (bacteria may become resistant to certain anti-biotics, rendering them ineffective) or that you are chronically inflamed rather than infected. You could discuss alternative medications with your GP (e.g. alternative antibiotics, or perhaps something which might reduce inflamation), or even try herbal / natural remedies (but I'm not sure what the evidence base for this is - google this and see what you think.
Now that you have stopped having sex, try the doctors again and try to clear the infection without sex. It is understandable that you might be afraid to have sex again, but when you do, make sure you use a condom, and urinate soon after penetration to 'wee out' any normal bacteria from the vagina/rectal area which may have migrated into the urethra and bladder.
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