Meshell, sorry to read of your worsening symptoms. I was diagnosed officially with MS in 2002 at the age of 24. I can give you the background on my what my symptoms were, but I'm sure you're aware that everyone with this disease is different.
My disease started with pretty heavy fatigue. I was in engineering school a the time, and I chalked it up to stress and studying long hours, but I would sleep 12+hours at a time and still not be able to get up. A couple of months after the fatigue started, I had a numb spot on the right side of my face. My primary care doctor figured it might be a virus that entered through a cold sore and attacked a nerve in my face, so he gave me some meds. It did seem to get a little better, but around 3 weeks after that I had a very intense headache while at school. I still remember the pain of this headache; it was the worst one of my entire life. I think it was worse pain than a migraine. I managed to get home, and later that night the entire right side of my face had gone numb - from above my scalp to my neck, including my right lip and right side of my tongue. Honestly thought I was having a stroke. The next morning I called my doctor, and by that time I was having motor control and paralysis on the right side of my body. I couldn't hold a pencil or a fork, and my right leg would drag like I couldn't pick it up. I was running into walls, and my balance was out of whack. Long story short, I got in to see a neuro, who diagnosed me with probable MS. I got an MRI and a lumber puncture (those are fun), and the MRI confirmed lesions in my brain.
Since then, I've only had one serious exacerbation, which was last summer. Again my balance was off, I had some numbness in my right cheek/face, and this time one of my eyes wasn't acting correctly which contributed to the balance/vertigo. I was given some pretty heavy doses of prednisone (steroids), and all my symptoms cleared up over the course of about 3weeks. This was given to me while I was in the UK, but all my other medical experiences have been with US healthcare. Every couple of years, I've had an MRI, and what are called 'evoked potential' tests to see if there is further nerve signal degradation. So far my vision, hearing and sciatic nerves are still responding pretty normal to stimuli (knock wood).
MS is definitely a very scary disease. Even though I've had it for 10+ years, I think there are still some days I still haven't come to terms with it. Some of that has to do with the fact that I am still 100% ambulatory, although I have noticed some fairly serious (at least to me) cognitive issues. So I can sometimes pretend I'm a normal person. However, I can no longer handle working as an engineer because of the stress, and the fact that my brain just cannot handle the critical thinking any longer. That's not entirely a bad thing, since I wasn't enjoying engineering anymore anyways!
There is hope for those of with MS. It's not the death knell it would have been 20+ years ago. There are therapies available, and other medical assistive devices that can extend viable years. In saying that, everyone's disease progression is different, so you really can't jump to any conclusions until you get to those bridges where you have to make adjustments in your life to accommodate for those things you can no longer do.
And there are other diseases out there that are very similar to MS. Please try not to jump to the worst case disease, until a specialist has that discussion with you. Sorry this is so long, I just wanted to share my story. And I'm sorry for typos and other misplaced words; that's actually one of the cognitive problems I have. I hope your story ends with a diagnosis of something curable!