1. Boil Parsley and Cilantro for good 4-5 minutes.
2. Drink every morning and evening, can add raw Honey or himalayan salt for taste.
3. For more, cool it off, fill your water bottle, and keep it in freezer.
4. Drink whenever you feel so.
If you doubt it's kidney, it detoxifies your kidney, loosen up debris , try it and feel fresh.

Testicle pain, I don't think is a serious problem, unless it's chronic. We, men, due to some hormonal imbalances sometimes tend to get those pain but it goes away in few days. If pain goes for long time, better consult your doctor.

Note: Have you been keeping your cellphone tucked in your pants front pocket, all time? Put it in airplane mode when at home say after 7 pm, or don't keep your phone in your pants pocket at all, just carry it in hand or some sort of backpack/bag/etc. See if it makes difference. (Cellphone close to your testicle kills your sperms, scientific fact and proven. )

My cousin had stone, and he was very thin, and suffering from abdominal pain all time, boy .. ask me that pain is excruciating, it literally made him sweat everytime he had that. Do you have similar symptoms?

If you doubt it's your kidney, your body also gives you signal to check for more,
-Frequent gum diseases
-Fainting
-mild lower back pain
-and of course color of your urine.

If your urine color is lime, you are fine/hydrated, but if it's dark brown/blood, you are in deep trouble.
Visit your local GP, asap.

Some B-complex multivitamins and certain vegetables like beets/asparagus, gives your urine different smell/color. You gotta keep track of those things as well, instead of freaking out.

Best of luck.

Knowing your innerself and your body is the Godliness :D