I’m sorry to hear that you may be joining our merry bunch of MSers.
How do you feel about it? Are you resigned to be hopefully getting a diagnosis, or sh*t scared? Whichever it is, you will probably worry yourself silly over the next few weeks until you get your final answer. The only good thing is that your neurologist seems to be moving quickly. I don’t think you need to worry about the speed, just be grateful for it.
Re the lumbar puncture, people are often bothered by the thought of it. Have a look at: https://www.mstrust.org.uk/a-z/lumbar-puncture It tells you about how it’s used to diagnose MS but there are links at the bottom of the page which tell you about the actual procedure.
Just make sure you lay down flat for as long as possible afterwards, and drink plenty of caffeine. People usually use full strength coke and a bendy straw (so you stay laying down). Both are to avoid a very nasty headache. Not everyone gets the headache from hell (I didn’t) and some people take the laying down/caffeine approach and still get a killer headache.
Let us know how you’re getting on. You might find it’s a good thing next time to start your own posting. Just hit the New Thread button, give it a title and write what’s happening, what questions you might have and how you’re doing.