My first guess would be he got himself parasitised and it hopped over to infect you when he visited. Parasites will follow the line of least resistance and family members are easy targets. Is he having any nightmares as well at all? Unless there’s a reason for him making a dick move like that.
As well as the above, do you have any wards and protections like shields in place?
We have a bunch of ideas for basic preventative as well as active measures that are worth taking as practitioners, as attracting unwanted astral entities is a common problem. Which some basic walls up if he brings in more critters with his next visit (assuming that’s what happened) it shouldn’t be an issue, and you may naturally clear them off him as well if you warded the whole house.