You need to go see a doctor and have your urinary tract infection treated. Even though it might seem like a trivial issue, chronic infections can cause more serious issues if they are left. A urologist who focuses on UTIs should be seen for the diagnosis and treatment of this condition.

It is common for one testicle to be larger than the other because they might not always grow to the same size. Usually, this does not cause any problems or need for treatment. If you have any pain, swelling, or changes in size it is best to see a doctor. They can make sure everything is okay and give you advice.

Phimosis is when the foreskin is tight and can't be retracted. This condition can lead to itching and difficulty in proper hygienic upkeep. Betnovate-N cream can help to get rid of the tight sheath. You can apply a small portion to the tight area when the foreskin is dry. One easy way is, to shallowly trigger it back to the elastic extent without making any patient uncomfortable. Alternatively, restrict your dosage of cream to avoid the risk of side effects. 

A swollen testicle and back pain could be from a condition called epididymitis. This happens in cases of infection or injury. On the other hand, medical check-up seems to be of utmost importance. They may come up with suggestions for the use of antibiotics or pain relievers. Always remember, it is always better to deal with these issues before they get out of hand.