Hi Katie -
I'm sorry you're going through a rough patch. I'm not a doctor, but waht you describe does not sound like MS to me. MS does not present with rashes or sores. It just doesn't. And the pins and needles associated with MS do not come and go. They come and stick around for a while, days, weeks, months...
I would kep the journal that your pimary suggested and try and relax a bit :-)
Hi Katie, I also don't believe what you have described happening to you, is actually related to a neurological condition like MS. The Lesions you'll read about with MS are in the brain and or spinal cord but you have lesions are located in you mouth, totally different type of lesion.
If you've been dx with shingles, the paresthesia sensations, skin lesions, heat rash etc would all be symptoms that are associated, so it's much more likely that what you've been experiencing is being caused by the shingles and not something else like MS that isn't associated with what you've described.