It could be any number of things, some of them serious. You MUST get to your doctor ASAP, and it makes good sense to stop sexual activity with partners until you get this taken care of.
This could be described as rest pain. It can happen if someone has peripheral arterial disease. The arteries are narrowed in this case and the blood supply to the lower limbs is reduced. This causes...
It depends on your gender, the type of pain (throbbing, stabbing), and the duration of pain. If it persists for more than 24 hours, or restricts breathing or movement for a long period of time, you...
It might be testicular torsion. This is where the blood supply to the testicle is twisted and shuts off. You would need to seek immediate medical care to prevent losing both the use of the testicle...
You probably have a uranary tract infection. Drink lots of cranberry juice and water this should clear up in a few days, but if not you may need antibiotics. Best wishes.