"urgent need for head mri scan"

after 4 weeks of my grandon being in severe pain ,,with head,jaw ,,face drooped ,, 6 visis to hospitals ,, 7 visits to local dr,, rsch are at this moment treating him for trigamel head nerve, the pain level he is in is classed as a suicidal pain,, we have come away from hospital with different pain killers ,, until mri scan is made,, Its basically very distressing ,,and to see a 21 yr old ,,cry with pain is awful,, today after yet another visit to rsch (recommended by our local dr) they have informed us ,, until we have the appointment for scan,, it can not be 100% trigamol nerve on brain,,how long is this scan likely to take,, have completely lost all faith ,, now ,,am just praying to god this is nothing serious for him, and pray also that the scan will be soon,, if I had the money I would go private,,