Suggest Remedy For Lower Abdominal Cramps

I am a male, at the age of 16 and i have a very tense, cramping pain in my lower abdominal, torso area. The pain leads from there to my testicles with a painful throbbong. It almost feels like some kicked me inbetween the legs, and the groin and basicaly twisted my privates. it is very sore to touch, like sitting in a seat, or walking, and standing straight up is painful for that lower abdominal area. If it helps, i have not been sexually actice or anything like that, and that i know of, i havent literally been hit in the groin. Now, i did have a prolonged boner last night, as i was with my girlfriend. because of my age, i still cant really control that. But if this soundls like anything that you could i dentify or just help me find releif to i would be much grateful.