Hello there,

I have had MRI's etc as part of my diagnosis. It is a good idea to rule out any nerve compression or damage that may be causing your pain as these things may make a cure a little easier. An MRI will show a very complex view of the nerves in you neck and head and is the best test for this.
A dermatologist is also a great idea, sometimes there needs to be a small biopsy of a rash to ascertain the cause and then the treatment.
It sounds as though you are really lucky to have a doctor who is willing to do all the investigations that will lead to the best outcome for you.
I wish you all the best, let's hope there will be a positive result for you.
Cheers
Tayla