What Causes Nausea, Vomiting, Dizziness And Back Pain?

I need to know if I should go to the emergency room or wait and try to get into my doctor, who is always booked out a couple months. On Monday night of this week, I got very nauseous, and early Tuesday morning was vomiting (by early, I mean between 2 and 3 in the morning it started.) Tuesday and Wednesday I rested still feeling dizzy, lightheaded and nauseous. Thursday I returned to work, only to have my back start to spasm on me and start hurting so bad I could no longer move. I was send home to rest. I got home and needed help getting into the house where I took some pain pills my sister found of mine. they are Oxycodone/APAP 10/325. I took 2 of them and found no relief. Friday, I rested and alternated between ice and heat all day, and took more of the Oxycodone/APAP pills, taking one every 4 hours and only feeling minor relief as long as i was not moving. The second I moved, I took 5 steps and had to call for help as I was in too much pain to move on my own. Now, it s almost 3:30 AM on Saturday, I m still not able to move on my own and can barely move with help due to all the pain. I m having to have my family carry me to the bathroom and back. I don t want to go to the emergency room unless I have to because I have had similar pain, though not as severe, due to kidney stones or UTI s. Based on this description, what is your medical opinion? Should I go to the emergency room, or wait till I can get into my own doctor and see if it gets better with time?