Is something wrong with my kidneys?

About a year ago almost, around september or october id say, i got a really bad urinary track infection. The doctors put me on antibiotics and while i was on them these cramps in my lower back started, i would get them a few times a day and the pain was almost unbearable, the pain would slowly creep in, hold me immobile for about a minute then slowly fade away, the doctor said it was just the infection and it should go away. Well after the infection was gone, i would get the same cramps every few months, but they are getting worse and worse, i started having them about once a month and now i have them a few times a month. A kidney infection cant last an entire year though, i dont know what to do. The cramps are in my lower back and sides, sometimes abdomen and last about a minute each with ridiculous pain, i cant find anything on the internet, help?