To strengthen your bladder muscle, you can try pelvic floor exercises, maintain a healthy weight, stay hydrated. Avoid bladder irritants like certain foods and drinks such as caffeine, alcohol, spicy foods, and artificial sweeteners, can irritate the bladder. 

This urination problem was due to a narrowing in the urethra which made it difficult for the urine to flow freely. Dilatation is a procedure to expand the urethra. It is essential to take your doctor's advice and go to all follow-up appointments to tackle this issue successfully.

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. 

It's normal for a clear fluid called pre-ejaculate to come out of the penis after urination or during arousal. This fluid can contain a small number of sperm and might be more noticeable when you're talking to a girl or feeling sexually aroused.