From what I gather from the other people here, the hospital will probably pump you with steroids until the inflammation goes down and unless your in debilitating pain with excessive swelling, they may just turn you away. I could be wrong.
If your pain is inhibiting your daily life, take the meds the doc already told you to take until you get something else. It stinks taking medicine, but you have to give what you ahve a try as eventually you will be taking something daily. Also, do what typically helps: ice/heat, strectching, walking, resting....until you get in to appt.
You should also start seeing a rhuematologist for the OA. They specialize in the medication for the disease and may have a stronger knowledge than your PCP to help you out. Call you doctor, get a referral, and let them know you can't wait much longer - you are in a lot of pain and the meds you have aren't doing the trick. Your PCP may be able to give you something to temporary to help with the pain until you see him or the rhuematologist.
Good luck. *****