Hi Missjay,
I do understand the fear that you must be going through right now. Your body is presenting all these new symptoms and you feel that you don't have any control over it and you don't know what it is. I experienced this feeling at 14 years of age when I was first diagnosed with MS.
If you are experiencing new symptoms, the important thing is not to ignore them and not to rule anything out.
In regards to the LP, try not to fear the worst. I will be honest, it is uncomfortable and painful, however it may be useful in finding out what may be happening to you.
It is also important that you trust the neurologist, and remeber that they are there to help you.
I know its much easier said than done but, try to take one step at a time and try not to fear the worst.
I hope all goes well for you

Good luck
Monique xxoo