There's tons of information on strokes, from that for the layman to the most esoteric medical. I went to the website for the National Institutes of Health, for example, and did a search on the word "stroke." The result was

"Your search for stroke matched 8717 documents out of 173307".

That's just at NIH.

Use a metasearch engine (like Metacrawler) and see what you find.

And good luck, and lots of patience!!