Need help! Nurses!

Ok so almost two weeks ago I started having this pain in my lower back it’s more like in my butt, at first it was kinda an annoying sensation but each day the pain gets worse and unbearable. I can’t sleep at all because I hurts so bad, it hurts if I sit down or when I stand up it hurts when I do anything and I’m taking medicine to help with the pain but nothing is working! A friend told me it could be sciatic nerve but I have no idea what it could be.