REALLY sore mouth!! Please please help! I'm desperate!?!

I've had braces for 2 years now, and am almost done. But last month I got elastics (rubber bands) that I was told I have to wear all the time. They hurt sooooooo bad, defiantly the worst part of the treatment for me so I haven't worn them very much because the pain is agonising! But I had an ortho appointment today and they told me I HAD to wear them now if I want my braces off. Well I've worn them for about 4 hours today and my mouth is throbbing with pain! I can't take it! So my question is what can I do to relieve the pain quickly, not like you will get used to them in a week. I can't deal with this kind of pain for a whole week! Also pain killers like tylenol and ibuprofen don't help me at all, I don't notice the pain go away even a little! They hurt so bad! What can I do to relieve this pain QUICK!!!???