Infection lasting more than three weeks

[Inactive_User]

Hi there - can anyone help? My partner (50 year old male with secondary progressive MS, diagnosed nine years ago) has been ill in bed with an infection for three weeks. He has a temperature of over 38 degrees, constant bouts of fever with involves sweats and bouts of severe chills, severe aches in his joints (especially elbows, shoulders, wrists etc at different times), and a strange red rash (flat, disappears when you press it, sometimes blotches or patches, sometimes looks like gashes and scratches), swollen feet. He is eating fairly normally, and going to the loo - no pain on passing urine. But he is deeply fatigued, and whilst normally he can walk at least half a mile and holds down a professional job, at the moment he is too weak to do anything (even read a book or check email) and can’t stand or move easily, and can only walk a few steps. The GP has said - “it is just a virus, nothing to do with MS and it will get better, there is nothing you can do”. After two weeks we took him in to the surgery where the GP looked visibly shocked at the the sight of him and took lots of blood tests. All have come back negative, except to say he has an infection, but he is still just as ill. I have also been told that no virus should last that long. He also had something similar but less bad off and on for six weeks last summer. Does anyone have any similar experience? I am told that MS cannot be the cause of this, and that it will get better on its own. But this does not seem likely. Any thoughts or advice anyone can share? Thanks