hi, im 17 and for the past couple of years now i keep randomly getting a really bad pain in just my right testi, it can last for an hour to to 5 hours.
but the wierd thing is i can get it once a week or even once a month??
and again the wierd thing is i only get it when i stand up, if i sit or lay down after a couple of mins i cant feel a thing but when i stand its just horrible i just want to lay down untill it goes

i know it cant be from sex because i started gettin the pains before i had had sex, thats why i have never really bothered going to see my GP as apart from the pain i have been fine ??

please help!
thanks guys