I'm kind of into medieval history too. I don't do Youtube that much, but if you have Amazon Prime there are some great historical documentaries on everything. Yeah, if I'm feeling down, perhaps ironically watching a medieval doc makes feel like it could be a lot worse.
I think they have a deal with The Great Courses, a longstanding lecture series company that's been around for a long time - I used to buy their cassette tape boxes back in the 90s. They give you an in-depth analysis on almost any topic in academia. The lecturers are generally the best in their fields at the top universities. Maybe not a lot of background re-enactments or fluff, but very informative.
If you have Amazon, I'd recommend the The Middle Ages Around The World, a 24-part series. You might be able to find it, or parts of it, on Youtube as well.