water infection?

For as long as i remember ive been prone to thrush and cystitis.
when i get thrush it can either be just a external itch or it can be excessive discharge and itch, or just the infection with no itch.
i had thrush a couple of months back after only having it the previous month, i was told to go to the doctors the next time i get it so they can do a swab. 

first of all let me just ask, as ive had cystitis alot i know what its like, it burns, hurts in my lower tummy and i need to wee every 2 mins, pass a dribble, be in a lot of pain, and start again in a few mins. i THINK i may have it again but this time im not needing the loo every 2 mins, it doesnt hurt as much when passing urine but it does hurt, and i have a burning pain in my lower tummy, can this still be a UTI?

when i went to the chemist last and was talking to the lady there, she said whenever i get any infection down there, wether its a UTI or thrush, to visit the Drs if i get them often, so i guess my question is, should i go to the Drs even though its a possible UTI not thrush, when the Dr only specified to come back when i have thrush? 

i can phone my Drs but just not yet so i thought id see what you ladies think