Glad you posted an update!

The blood work is one of the first things they do.....I remember they took so many vials of it from me!
I didn't have a spinal tap. I did have an MRI.
You'll get advice from every angle. You don't have to decide anything right away. This forum can give you lots of guidance and first hand experiences from those of us who've been dealing with MS for years.
Hang in there.....and keep coming here. We (seem) pretty smart once you get to know us!!