Jessica
Chiari certainly can explain a lot of these symptoms--maybe even all of them. Good luck with the MRI, and please let us know.
Also, make sure to get your thyroid and Vitamin D levels checked out. You have symptoms of both, particularly the Raynaud's-like cold extremities. I have both hypothyroid and extreme D deficiency, so I know about this first-hand. I also know thyroid issues can be common with neuro dxs, including ACM (which my son has) and hydrocephalus (which I have). You're fortunate to be in FL (where the weather isn't the North Pole winters we get up here in New England), but D malabsorption is still a possibility and may explain some of your symptoms.
Good luck!
LIZARD