how many cortisone shots can i have

i have had 3 lots of injections this year with intense physio and so many differant pain killers trying to ease the pain i feel in my shoulder, i went last week to see gp and begged for an injection as its the only thing that eases the pain, but he told me ive had my quota for the year, max of 3 shots per year, not good as no idea how long im having to wait for my surgery, i am at my lowest now, i cannot take much more of this pain, it has reached another level this past month, hope you can find something that will ease the pain.

As a general rule a reasonable approach is to limit the frequency of injections to 3-4 for a single joint per year