Hi Porsche, you sound like you're in trouble. Others like Oleg and Spirit are more expert in this kind of advice but I guess they aren't around at the moment. Usually, the advice posted for this sort of situation is hot water bottle/heating pad, castor oil packs over the affected area, try taking a mini-dose of Epsom Salts or magnesium citrate, it could help to relax things. I guess you could also try taking a couple of tablespoons of olive oil. Maybe your fall caused a stone to get lodged somewhere. Try visualise it passing through, lie down, relax, meditate.
Hope this is helpful and I hope you get better in time for the movie.