Montymum HI! I know exactly where you are at with this. I was there about a month ago and, in truth, for the last several years. With the help of this forum, I've gotten to a place where I can accept the idea of surgery, and, in fact, even welcome and look forward to it.
I've had a lot of pain for a long time, but suddenly in the last few months it got a lot worse and now I can barely get around with two canes. I was absolutely flat out terrified, had been for years. Now I've gotten over my panic and see the surgery as a key to a new life free of pain. I'm now scheduled to have both hips replaced, the first on September 30, and I am at peace with it, still scared, still wake up in the wee hours of the morning with an attack of fear now and then, but I can manage it.
My OS told me that the injections wouldn't do me any good, particularly in light of how awful my hips looked radiologically. He also said they help some folks for a few weeks or months, but they don't help anywhere near everyone and are a temporary help at best.
Your hip won't do anything but get worse until you find yourself in the same boat as me, unable to do much of anything, and in pain all the time, or in a wheelchair, which is where I was headed.
Do go ahead and schedule your surgery, get it over with, and get back to your life. I can't wait to walk my dogs again, ride my bike, and stuff like that!
PS: If all this sounds like I am very brave, I'm not. I'm a great coward and tried to fool myself for several years that it would go away on its own, or wasn't so bad, or I could find something else that helped. I spent much time crying and fussing and worrying and being terrified, until the time came I could not get around the house without the canes and I realized I didn't want to spend the rest of my life like this.
You've come to the right place for support and understanding.
Peace and love.