What can I do to ease the pain from irritated labia?

When I woke up this morning my labia was swollen and red. I've only peed once today because it hurts SO bad to pee. I just put desitin on it to try to sooth it and I've had a ice pack on it all afternoon and evening. The swelling has gone down, but it's still pretty red and raw, especially near my l opening. The soonest I can go to the ER is tomarrow afternoon. If it still hurts unbearably by tomarrow what can I do to help with the pain so I don't have to hold my pee or go though awful pain? And no, I do not have any STDs. I'm 115% sure of it.