Some Positive Thoughts Please

I wrote before about how I was nervous about Norbert, who will be 12 in July.  Two weeks ago he started peeing inside and there was blood in his urine.  We did a urine culture and he had a bladder infection, ecoli.  We gave him antibiotics for two weeks and he improved immediately, right after the first pill.   We did a urinalysis, but no culture, that was free of bacteria after the antibiotics were finished.  However, after 4 days off the antibiotics the symptoms returned.  Since we didn't do a full culture last time after finishing the antibiotics its possible that the infection wasn't knocked out completely.  However, we know we used the right medication as we did a urine culture to start.   My vet prescribed two more weeks of antibiotics since he thinks we simply didn't get all the infection.  However, I am worried that these recurrent infections are the sign of a bigger issue, as he has never had them before and they are uncommon in male dogs.   I googled, shouldn't have done that, and it is a symptom of bladder cancer.   That got me super nervous even though my vet says its unlikely.  Then my vet revealed the horrible news that he is leaving the practice.  This is my favorite vet ever in 13 years, and I was reduced to tears by the news, crazy as that is.   So we could use some positive vibes and also if anyone has dealt with any of the issues mom would appreciate any advice.  Particularly if you have seen it in male dogs.  I apologize if we haven't been by blogs enough lately Im just a bit stressed.