ARM PAIN

I PLAY ALOT OF SPORTS SOFTBALL,BASKETBALL,GOLF,HOCKEY I HAVE ONE PROBLEM I PLAY CENTERFIELD AND NO MATTER HOW MUCH I WARM UP AFTER MAKING HARDER INTENSE THROWS IN A GAME I USUALLY BEGIN TO HAVE ALOT OF PAIN IN MY BICEP AREA LIKE A HORRIBLE TOOTHACHE LATELY IT HAS BEEN GETTING WORSE I CAN NOT SEEM TO STEADY MY ARM AS IT BECOMES WEAK SHAKY ETC.ALSO THE PAIN WORSENS AND DAYS AFTER I STILL FEEL PAIN AND IT NOW HAS TRAVELED DOWN INTO MY FOREARM AND ALITTLE INTO MY HAND AND FINGERS…ANY ADVICE PLEASE LET ME KNOW… I HAVE ALSO BEEN TOLD BY MY FATHER THAT THIS HAPPENS TO EVERY MALE IN THE FAMILY SO I THINK I MIGHT BE DOOMED!