!!!!!!!!!!!

I've been with my SO for 7+ years and recently he's started having these mini-episodes/ blackouts due to (what I'm thinking) stress at work. He doesn't do drugs other than smoking marijuana occasionally. It really scares him that this happens. He isn't violent or anything, he's just unresponsive and loses coordination of his legs and never seems to have any recollection of what happened the next day. This has been going on for maybe a month or so. Leaving him because of this isn't an option, but I was wondering if anyone else knows anyone who has suffered from this or even had it happen to themselves at one point. What did you do to control it?