Do contact your local ALS assoc. for any help. If he's having breathing issues now, perhaps they can get him evaluated soon. Even a GP can do a pulmonary referral for PFT tests and sleep study while you're waiting.
There ismromsmof great info here. He will be approved for SSDI if he's got the work credits. Medicare kicks in at the same ri,e the checks do (5momths) after he stops working. ALS is also considered military related if he was active duty in any of the armed forces.
I'd suggest you sit with the ALS assoc rep and discuss what aids might be needed in the neat future, and start getting them and learning their use before they are needed.
Most ALS loaner closets have lots available if $ is an issue.
Sorry to sound morbid, but ot does let one feel as though they have some control if they can be proactive early.
Last tip.vthere are lots,of trials going on. Ask about them, and live each day to its fullest. Hugs and welcome to the forum people here will answer any questions you might have.