In all seriousness, a denial. Don't get your hopes up.
I've gone through applying, being denied, and then filing an appeal, which is where I am currently in the process for SSDI.
Feeling better and having fewer symptoms might lead to a review, but it's unlikely your rating would be completely removed, especially if you need to stay on medication to maintain that improvement.
Usually not, except if their VA facility provides care options for family members.
This is all the info you'll need for CHAMPVA:
https://www.va.gov/COMMUNITYCARE/programs/dependents/champva/champva-apply.asp