What Do Frequent Urination And Recurrent UTI Indicate?

Hello, I m a 34 years old man and for more than 15 years I m suffering from frequent problems with urinating often, UTI s and pretty much all the symptoms that would theoretically lead to urology. However all the tests that I ve made during these years don t draw a conclusion that I would have something major. Two months ago though I had this pyelonephritis on my right kidney which came out after an ecography. And again like all the times, among all the tests that I ve made, the urine culture was negative. After treating this, I started to have frequent tonsillitis and my immunity became so sensitive, that even after a glass of cold water I m waking up the next day with a sure throat. I took anti-inflammatory pills for some days, I felt better but after a week, it had a recurrence which needed to be treated with antibiotics because I started to have fever. Just two days after I finished with the antibiotics, I started to have sure throats again. Because my first UTI episode that happened at the age of 18, came later in the spring after a very bad tonsilitis in the winter, I d like to ask if there s a connection between these two problems and if I should have a tonsil removal surgery. I also have to mention that I catch colds and flu symptoms very often during the winter season. Thank you very much.