Oh my gosh what a week!
At least you know it's gotta get better from here!
My mom had a mini stroke a year and a half ago and it is such a blessing in disguise! She hadn't been to a doctor in at least 20 years and now she's forced to go for check-ups, had a ton of tests and is on medication, and has quit smoking! I hope your FIL gets some insight with the tests they're running on him.