I have to wait till September to get my tooth pulled, in a lot of pain. Solutions?

I have a huge cavity in my back tooth, so huge that there is no point having it in there any more. But my appointment isn't till septmeber as my dentist is completely booked up and I'm in agony, taking about 6-8 painkillers a day and one extra at night that helps me sleep. It's making me hate eating and I just want to eat like a normal person without making a conscious effort to keep all my food on one side. I need solutions for the pain or for how I can possibly loosen the tooth and get it to come out. I really scared of the dentist, I had an emergency appointment but I wouldn't let them go near me with the needle and so I was just left in more agony for longer. I don't know what to do, I just want to get rid of this pain.
I have to wait till September to get my tooth pulled, in a lot of pain. Solutions?
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