I Have Severe Low Back Pain. I Am Seeing A

I have severe low back pain. I am seeing a pain specialist. He has prescribed Oxycodone 7.25 every 8 hours, and between the pain pill 800 mg of ibuprofen. It doesn't even touch the pain. I can only stand for about 1 min before my back hurts so bad I have to sit down. I'm using a bench in the shower because of the pain in standing. Please help with what I can do to get relief. I'm ready to have my son take me to the ER. This is interferring with work and life in general.