My itch wont go away, Help?

Help me please! I've been having this itch since saturday(Feb 5, 2011) and it won't go away, you see It starts anywhere on my body and sometimes in multiple places. It usually starts as a minor itch. If I itch it, it feels relieved for about few seconds and then gets much worse. Also redness starts to show and bumps form as well but a few minutes later they disappear. It itches on my hands, arms, feet, stomach neck, back...well basically EVERYWHERE! My mom knows about it so she buys me two kinds of lotion ( original sarna anti-itch lotion and calahist medicated calamine lotion) when I use these lotion it relieves the itchiness but only for a few min. So my mom gives me allergy medicine from the company kirkland signature( there small pink pills) and I drink only one before I go to bed, it helps for a while but itch comes back. By the way, I've been reading other ppls experience with the itch having it to do with a sexaully transmitted disease well I'm 15 and I will no do no such thing, so help me out here please!