Work is getting hard with MS

Questions about accommodations and planning ahead

What documentation do I need for accommodations — and can you write the supporting letter?
Can you fill out FMLA paperwork or short-term/long-term disability claim forms when I need them?
How do you describe my MS in disability paperwork — what language tends to help these claims get approved?
If my employer's HR or my disability insurer calls to verify, will you or your office speak with them?
When should I start thinking about disability benefits, given how my MS is going?
How should I plan for potential progression — what would tell us it is time to scale back at work?