How horrible for you. I am not a dream expert but have done some research over the years because I also have had dreams that disturb me. Usually most bad dreams are a result of fear. You can interpret that into your own dreams but my guess would be that pain combined with fear of more pain with no end in sight can certainly result in more bad dreams. I was given some advice about how to change dreams and it helped me with a reoccuring dream that involved much fear. I wrote down how I would like the dream to end (a wonderful ending with me winning over the fear) and each night before I went to bed I would read it. To my surprise one night I had the same dream but the ending was exactly as I had wished it to be and in 5 years I have not had the dream come back.
Try it can't hurt!