Well. There's some things to unpack here, first being that the witch thing? As someone who hangs out with the Medievalists, that's not ours. I commend to your attention the appropriate section of the FAQ dealing with witchcraft; you'll note it's under the Early Modern. The stereotype of the independent herb-woman persecuted for witchcraft is specifically addressed by u/sunagainstgold there.

Second is that the 'medieval dark ages' are a myth, period, not just "as they apply to science/natural philosophy". Here's a Christmas present I gave to someone on the same kick. Labeling the Medieval Period as 'dark' kind of loses its bite when you consider that not only were they more than capable of building aqueducts, they did so out of a concern for public good.

I'm also considering tossing in some links about Medieval medical practice (some of which, no joke, directly involves dealing with elves; Anglo-Saxon England is a wonderful place), but that may be me reading into your post subtext that isn't actually there, namely the typical baleful view of Medieval medicine, which...isn't really a thing.