Oh no, I really hope your kitty just has an infection! When my boy Sneezer was about 7-8 years old, he had two UTI’s 5 weeks apart. I switched him to a urinary tract formula food and have been giving him one Cosequin capsule daily for the last three years. Haven’t had one sign of a problem since!
And actually, from what I am reading on on google just now, it is possible to cath a cat without sedation if there is a blockage. I’m sure this is no fun, but hopefully you will have options!