Hi Brenda
GP's are generally reluctant to adjust meds prescribed by the consultant however, in my experience, they do it when necessary! I'm not sure what strength of Naproxen you are on 250mg x2 or 500mg x2? That may be an alternative way forward, as an interim measure, to the steroids and possibly a call to the GP may sort it out for you. Perhaps you need a different anti inflammatory? Naproxen doesn't work for everyone and there are a wide range to choose from so possibly worth considering.
Whilst local steroid injections are fine, when they work, because they are joint specific, oral prednisolone affects the whole body including the body's own mechanism for producing steroid. As you know it is highly potent even in small doses hence the medics reluctance to prescribe it. I was involved in a study about 18 months ago, I have been on steroids for over 20 years in varying doses, and the results of even short term use were quite startling. That said steroids are wonderful for their immediate impact!!
Hope you get something to ease your pain soon.
Lyn x