Re: spinal tap
Glad you got thru the tap with relative ease. The after affects are typical and a nuisance, but you're on the back side of this whole thing so that's a plus.
Sounds like you're going thru a grieving period right now which is only natural. Yes, some things in your life may change, but you will start feeling better and life goes on.
As for whether or not to tell your child? My DH and I never said anything to our kids when they were small. In fact, they only found out a few years ago when one Christmas they were whispering to Dad, 'wow, Mom's really been drunk a lot lately!' Apparently my balance issues that I thought I was controlling so well were much more obvious to those around me than I realized.
DH came and told me it was time to fill them in. After all, they were in their 20's by then. My DS did the guy thing: shrug and try not to think about it and maybe it'll go away. Eventually he addressed it. My DD cried and cried. When I told her she wasn't helping me one bit, she snapped out of it. She got educated, informed, and became a major organizer and team captain of her company's MS Walk team, collecting donations in excess of $50K in just a couple of walks.
They're both fine with not having been told and say it probably was harder on me than on them finding out when they did. So for that they felt bad for me, not themselves. I would do it the same way assuming my sx progressed the same (slowly).