Why do I have urethra pain?

More detailed history and tests like Uroflowmetry and Ultrasound with Post void residual measurement will give accurate diagnosis. If it’s BPH only and not improving with medicines then might need a surgical treatment. There could be other reasons like urethral stricture or high bladder neck which is also dealt surgically.

Essentially, a varicocele occurs when the veins within the scrotum expand, causing them to fill with blood – but commonly without any symptoms. Some people might experience a kind of achy pain or heaviness. It is not harmful at all to masturbate when you have it. If the valves in the veins aren’t working properly this could lead to what causes them in most cases. 

Based on your description of the symptoms, it might be that you had an acute urinary tract infection and antibiotics were used to treat it. Drinking plenty of water is needed and energy drinks should be avoided because dehydration can make UTI symptoms worse. If you are still shaking or experience other similar symptoms after the treatment, you should go to the doctor who prescribed the antibiotics to you or see a urologist.