hi karen and welcome to NT,

you've gotten some great advice.
CT can be dx'd with a nerve test of the arms/wrists. a hand dr could do it.
you just can't blindly dx it.

when trying to dx MS sometimes the dr first has to make sure you don't have other things. so it's a process of elimination. often an mri of the brain and c-spine is done to check for MS lesions.

keep up your journal. and be firm but calm when talking to your dr.
keep a list of Q's. it's also a good idea to bring a friend or family member with you for a 2nd set of ears.

good luck and keep us posted.