The risk is more from an adrenal crisis which is life threatening than PMR which is not. If it is a case of persuading receptionists, you need to say that you need urgent help you need to tell them that it is dangerous to be without steroids especially when you are ill. I would still call 111 *as well* instead of trying to get through to your GP to speed things up. You don’t need your own GP because any doctor should see the problem.
No it isn't OK. You should call the GP for an injection of steroid and if you can't get through to them, call 111. While ill you actually need MORE pred to be able to recover and after the time you've been on above 10mg pred you are at risk of an adrenal crisis with no pred in the system and that is a real medical emergency - which can be averted very simply with a couple of injections.
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