Every time I get anything like that I take a VegiCap of concentrated Cranberry for a day or 2 and it knocks it right out. I don't remember what brand . But I'm sure real Cranberry juice NOT COCKTAIL would work too. But you would have to drink ALOT of it.
I'm in the same boat... I get them ALL the time. going back to the urologist this Friday actually and will let you know if I get any tips.
in the meantime, I like those heating pads that you can get at the drug store- the type that stick to you or your underware and they stay hot for like 9 hours. that always makes me feel a bit better. keep up drinking the water, don't drink caffeine or alcohol, go to the bathroom whenever you need to (which i know is sometimes hard to tell with a uti!). the orange-pee drugs (uristat) will help a ton, i'm sure. they are miracle-workers. but be sure to eat w/ them!! otherwise you'll get a nasty stomach ache... actually i sometimes get the stomach ache even if i do eat. uti's are such a curse!!! good luck, feel better soon!!