back pain that wont go away

i apologize that this is in english. i apparently have akemet since a young age. i dont know it in degrees. i am now 24 and have lower back pain all the time. if i stand for more than 10 minutes my back begins to hurt and i have to lie down. if i sit for a while, my lower back gets stiff and when i bend down it really hurts. i have seen many specialists, but nothing seems to help. i have tried learning alexander method, i do pilates, stretching, exerise, yoga, work on balance every day- but nothing helps. what else can i do? it wont go away.