get a note from the doc. I got disability from my job $200 dollars a week based on 50k a year. Not much, but it helped. They then let me go when I tried to come back-they screwed me over. His work would probably be different (long story). He can also do fmla any time he wants, federal law that lets him take off when he needs but doesnt get paid.
Yes, he should be able to get the disability especially if the employer is offering it. Maybe he can get a less stressful job in the company. Men that travel get very lonely and stressed.