Hi Sorry that you are having problems.
I agree with the advise to see GP first. It will surely be a far quicker way to get some form of pain relief and then they will probably suggest that you also speak to your MS nurse aswell.
If your contact with the MS nurse is same as mine and you go through an advice/booking service it could take a few days before you could speak to them and get help. So again unless you have a really rubbish GP service seeing them first would at least get you some relief whilst you wait for the nurses input.
Wish you we’ll and hope you are soon pain free.
Equus1965