You really have my sympathy, how frustrating - big hug, it's enough to cope with keeping good control never mind the add on of a UTI.
I was getting these when I ran high - I was on a training course for a new job in London and got one, really uncomfortable - I found a great product at Boots though that didnt contain sugar and you took it about 5 times a day with water and that worked quickly for me - have you tried it ? I also got one from not going to the loo quickly enough, it's important to flush the tanks regularly !
Until you're well try and gulp down as much water as possible - avoid tea/coffee/alcohol and sadly it's connected to the running high, once you get a better range it will go away I promise. Try to stay positive and know that it will go away and well done on getting your BG down, that's definately a step in the right direction, in the meantime take it easy and try not stress about it. Good luck x